Colombia, officially the Republic of Colombia (Spanish: República de Colombia), is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the northwest by Panama; and to the west by the Pacific Ocean. Colombia has maritime borders with Venezuela, Jamaica, Haiti, the Dominican Republic, Honduras, Nicaragua and Costa Rica. Colombia is the 26th largest country by area and the 27th largest by population, and the third largest in South America after Brazil and Argentina. With over 46 million people, Colombia has the third largest population of any Spanish-speaking country in the world, after Mexico and Spain. It is also the only country in South America having coasts in the Pacific Ocean and in the Atlantic Ocean.

The territory of what is now Colombia was originally inhabited by indigenous peoples including the Muisca, Quimbaya, and Tairona. The Spanish arrived in 1499 and initiated a period of conquest and colonization ultimately creating the Viceroyalty of New Granada (comprising modern-day Colombia, Venezuela, Ecuador, north-western Brazil and Panama), with its capital at Bogotá. Independence from Spain was won in 1819, but by 1830 "Gran Colombia" had collapsed with the secession of Venezuela and Ecuador. What is now Colombia and Panama emerged as the Republic of New Granada. The new nation experimented with federalism as the Granadine Confederation (1858), and then the United States of Colombia (1863), before the Republic of Colombia was finally declared in 1886. Panama seceded in 1903.

Colombia was the first constitutional government in South America, and the Liberal and Conservative parties, founded in 1848 and 1849 respectively, are two of the oldest surviving political parties in the Americas. However, tensions between the two have frequently erupted into violence, most notably in the Thousand Days War (1899–1902) and La Violencia, beginning in 1948. Since the 1960s, government forces, left-wing insurgents and right-wing paramilitaries have been engaged in the continent's longest-running armed conflict. Fuelled by the cocaine trade, this escalated dramatically in the 1980s. Since 2000 the violence has decreased significantly, with many paramilitary groups demobilising as part of a controversial peace process and the guerrillas losing control of much of the territory they once dominated. Meanwhile Colombia's homicide rate almost halved between 2002 and 2006. As of 2011 Colombia remains the world's largest producer of cocaine alongside countries as Peru and Bolivia, although production has been falling. According to the Institute for Economics and Peace Colombia is the most violent nation in Latin America as of 2011.

Colombia is very ethnically diverse, and the interaction between descendants of the original native inhabitants, Spanish colonists, Africans brought as slaves and twentieth-century immigrants from Europe and the Middle East has produced a rich cultural heritage. This has also been influenced by Colombia's varied geography. The majority of the urban centres are located in the highlands of the Andes mountains, but Colombian territory also encompasses Amazon rainforest, tropical grassland and both Caribbean and Pacific coastlines. Ecologically, Colombia is one of the world's 17 megadiverse countries, and is considered the most megadiverse per square kilometer.

Prehistory

Due to its geographical location the present territory of Colombia was a corridor of populations between Mesoamerica, the Caribbean, the Andes and the Amazon. The oldest archaeological finds were found at sites of Monsú and Pubenza and dating from about 20,000 years B. C. Other vestiges realize that there were also early occupation in regions like El Abra between Tocancipá, Zipaquirá and Tequendama in Cundinamarca. These sites correspond to the Paleoindian period. In Puerto Hormiga has been found traces of the archaic period, including the oldest pottery found in America, dating from about 3,000 BC.

Pre-Columbian

Approximately 10,000 BC, the territory of what is now Colombia was originally inhabited by indigenous people including the Muisca, Quimbaya, and Tairona. Hunter-gatherer societies existed near present-day Bogotá (at "El Abra" and "Tequendama") which traded with one another and with cultures living in the Magdalena River Valley. Beginning in the first millennium BC, groups of Amerindians developed the political system of "cacicazgos" with a pyramidal structure of power headed by caciques. The Muiscas inhabited the area of what is now the Departments of Boyacá and Cundinamarca high plateau mainly (Altiplano Cundiboyacense). They farmed maize, potato, quinoa and cotton, among others. Skilled in goldsmiths, bartered emeralds, blankets, ceramic handicrafts, coca and salt actively trading these with neighboring nations. The Taironas inhabited in northern Colombia in the Andes isolated mountain range of the Sierra Nevada de Santa Marta.

Spanish discovery (1499 - 1525)

Spanish explorers made the first exploration of the Caribbean littoral in 1499 led by Rodrigo de Bastidas. Christopher Columbus navigated near the Caribbean in 1502. In 1508, Vasco Núñez de Balboa started the conquest of the territory through the region of Urabá. In 1513, he was the first European to discover the Pacific Ocean, which he called Mar del Sur (or "Sea of the South") and which in fact would bring the Spaniards to Peru and Chile.

Alonso de Lugo (who had sailed with Columbus) reached the Guajira Peninsula in 1500. Santa Marta was founded in 1525, and Cartagena in 1533. Gonzalo Jiménez de Quesada led an expedition to the interior in 1535, and founded the "New City of Granada", the name soon changed to "Santa Fé." Two other notable journeys by Spaniards to the interior took place in the same period. Sebastian de Belalcazar, conqueror of Quito, traveled north and founded Cali in 1536 and Popayán in 1537; Nicolas Federman crossed the Llanos Orientales and went over the Eastern Cordillera.

The Caribbean people, whom the Spaniards conquered through warfare and alliances, while resulting disease such as smallpox, and the conquest and ethnic cleansing itself caused a demographic reduction among the indigenous people. In the 16th century, Europeans began to bring slaves from Africa.

Colonial times (1525 - 1808)

The Spanish settled along the north coast of today's Colombia as early as the 1500s, but their first permanent settlement, at Santa Marta, was not established until 1525. In 1549, the institution of the Audiencia in Santa Fe de Bogotá gave that city the status of capital of New Granada, which comprised in large part what is now territory of Colombia.

With the risk that the land was deserted, the Spanish Crown sold properties to the gobernors, conquerors and their descendants creating large farms and possession of mines. Black slaves were introduced as labor. Also to protect the indigenous population decimated, and Indian reservations were created. The repopulation was achieved by allowing colonization by farmers and their families who came from Spain. With this began the colonial period. New Granada was ruled by the Royal Audience of Santa Fe de Bogota, but important decisions were taken to the colony from Spain by the Council of the Indies.

A royal decree of 1713 approved the legality of Palenque de San Basilio founded by runaway slaves from the fifteenth century, slaves had fled and sought refuge in the jungles of the Caribbean coast. The Spanish forces could not tolerate them and ended up submitting, thereby giving rise to the first free place in the Americas. It was their principal leader Benkos Biohó, born in the region Bioho, Guinea Bissau, West Africa. Palenque de San Basilio was declared in 2005 as a "Masterpiece of Oral and Intangible Heritage of Humanity" by UNESCO.

In 1717 the Viceroyalty of New Granada was originally created, and then it was temporarily removed, to finally be reestablished in 1739. The Viceroyalty had Santa Fé de Bogotá as its capital. This Viceroyalty included some other provinces of northwestern South America which had previously been under the jurisdiction of the Viceroyalties of New Spain or Peru and correspond mainly to today's Venezuela, Ecuador and Panama. So, Bogotá became one of the principal administrative centers of the Spanish possessions in the New World, along with Lima and Mexico City, though it remained somewhat backward compared to those two cities in several economic and logistical ways.

During the eighteenth century noted the figure of the priest, botanist and mathematician José Celestino Mutis (1732–1808), delegated by the viceroy Antonio Caballero y Góngora to conduct an inventory of the nature of the New Granada, which became known as the Botanical Expedition which classified plants, wildlife and founded the first astronomical observatory in the city of Santa Fe de Bogota. On August 15, 1801 the Prussian scientist Alexander von Humboldt reaches Fontibón where he joins Mutis in New Granada expedition to Quito.

Independence from Spain (1808 - 1824)

Since the beginning of the periods of conquest and colonization, there were several rebel movements under Spanish rule, most of them were either crushed or remained too weak to change the overall situation. The last one which sought outright independence from Spain sprang up around 1810, following the independence of St. Domingue (present-day Haiti) in 1804, which provided a non-negligible degree of support to the eventual leaders of this rebellion: Simón Bolívar and Francisco de Paula Santander.

A movement initiated by Antonio Nariño, who opposed Spanish centralism and led the opposition against the viceroyalty, led to the independence of Cartagena in November 1811, and the formation of two independent governments which fought a civil war – a period known as La Patria Boba. The following year Nariño proclaimed the United Provinces of New Granada, headed by Camilo Torres Tenorio. Despite the successes of the rebellion, the emergence of two distinct ideological currents among the liberators (federalism and centralism) gave rise to an internal clash which contributed to the reconquest of territory by the Spanish. The viceroyalty was restored under the command of Juan de Samano, whose regime punished those who participated in the uprisings. The retribution stoked renewed rebellion, which, combined with a weakened Spain, made possible a successful rebellion led by the Venezuelan-born Simón Bolívar, who finally proclaimed independence in 1819. The pro-Spanish resistance was finally defeated in 1822 in the present territory of Colombia and in 1823 in Venezuela.

The territory of the Viceroyalty of New Granada became the Republic of Colombia organized as a union of Ecuador, Colombia and Venezuela (Panama was then an integral part of Colombia). The Congress of Cucuta in 1821 adopted a constitution for the new Republic. Simón Bolívar became the first President of Colombia, and Francisco de Paula Santander was made Vice President. However, the new republic was very unstable and ended with the rupture of Venezuela in 1829, followed by Ecuador in 1830.

Post-independence and republicanism (1824 - 1930)

Colombia was the first constitutional government in South America, and the Liberal and Conservative parties, founded in 1848 and 1849 respectively, are two of the oldest surviving political parties in the Americas.

Internal political and territorial divisions led to the secession of Venezuela and Quito (today's Ecuador) in 1830. The so-called "Department of Cundinamarca" adopted the name "Nueva Granada", which it kept until 1856 when it became the "Confederación Granadina" (Granadine Confederation). After a two-year civil war in 1863, the "United States of Colombia" was created, lasting until 1886, when the country finally became known as the Republic of Colombia. Internal divisions remained between the bipartisan political forces, occasionally igniting very bloody civil wars, the most significant being the Thousand Days' War (1899–1902).

This, together with the United States of America's intentions to influence the area (especially the Panama Canal construction and control) led to the separation of the Department of Panama in 1903 and the establishment of it as a nation. The United States paid Colombia $25,000,000 in 1921, seven years after completion of the canal, for redress of President Roosevelt's role in the creation of Panama, and Colombia recognized Panama under the terms of the Thomson-Urrutia Treaty. Colombia was engulfed in the Year-Long War with Peru over a territorial dispute involving the Amazonas Department and its capital Leticia.

The Violence and the National Front (1930 - 1974)

Soon after, Colombia achieved a relative degree of political stability, which was interrupted by a bloody conflict that took place between the late 1940s and the early 1950s, a period known as La Violencia de los Putos ("The Violence of the bastards"). Its cause was mainly mounting tensions between the two leading political parties, which subsequently ignited after the assassination of the Liberal presidential candidate Jorge Eliécer Gaitán on 9 April 1948. This ensuing riots in Bogotá, known as El Bogotazo, spread throughout the country and claimed the lives of at least 180,000 Colombians.

From 1953 to 1964 the violence between the two political parties decreased first when Gustavo Rojas deposed the President of Colombia in a coup d'état and negotiated with the Guerrillas, and then under the military junta of General Gabriel París Gordillo.

After Rojas' deposition the Colombian Conservative Party and Colombian Liberal Party agreed to the create the "National Front", a coalition which would jointly govern the country. Under the deal, the presidency would alternate between conservatives and liberals every 4 years for 16 years; the two parties would have parity in all other elective offices. The National Front ended "La Violencia", and National Front administrations attempted to institute far-reaching social and economic reforms in cooperation with the Alliance for Progress. In the end, the contradictions between each successive Liberal and Conservative administration made the results decidedly mixed. Despite the progress in certain sectors, many social and political problems continued, and guerrilla groups were formally created such as the FARC, ELN and M-19 to fight the government and political apparatus.

The Medellín and Cali cartels

Emerging in the late 1970s, powerful and violent drug cartels further developed during the 1980s and 1990s. The Medellín Cartel under Pablo Escobar and the Cali Cartel, in particular, exerted political, economic and social influence in Colombia during this period. These cartels also financed and influenced different illegal armed groups throughout the political spectrum. Some enemies of these allied with the guerrillas and created or influenced paramilitary groups.

Constitution of 1991

The new Colombian Constitution of 1991, ratified after being drafted by the Constituent Assembly of Colombia, included key provisions on political, ethnic, human and gender rights. The new constitution initially prohibited the extradition of Colombian nationals, causing accusations that drug cartels had successfully lobbied for the provision; extradition resumed in 1996 after the provision was repealed. The cartels had previously promoted a violent campaign against extradition, leading to many terrorist attacks and mafia-style executions. They also tried to influence the government and political structure of Colombia through corruption, as in the case of the 8000 Process scandal.

Since the promulgation of the Constitution of 1991 and the reforms made, the country has continued to be plagued by the effects of the drug trade, guerrilla insurgencies like FARC, and paramilitary groups such as the AUC, which along with other minor factions have engaged in a bloody internal armed conflict. President Andrés Pastrana and the FARC attempted to negotiate a solution to the conflict between 1999 and 2002. The government set up a "demilitarized" zone, but repeated tensions and crises led the Pastrana administration to conclude that the negotiations were ineffectual. Pastrana also began to implement the Plan Colombia initiative, with the dual goal of ending the armed conflict and promoting a strong anti-narcotic strategy .

Colombian armed conflict, 2002 - present

During the presidency of Álvaro Uribe, the government applied more military pressure on the FARC and other outlawed groups. After the offensive, supported by aid from the United States, many security indicators improved. Reported kidnappings showed a steep decrease (from 3,700 in 2000 to 172 in 2009 (Jan.-Oct.)) as did intentional homicides (from 28,837 in 2002 to 15,817 in 2009, according to police, while the health system reported a decline from 28,534 to 17,717 during the same period). The rate of abductions declined steadily for almost a decade until 2010, when 280 cases were reported between January and October, most concentrated in the Medellín area. While rural areas and jungles remained dangerous, the overall reduction of violence led to the growth of internal travel and tourism.

According to official statistics from the Colombian Army FARC-EP had a total of 18,000 members as of December 2010, with 9,000 of them being regular guerrillas and the rest armed militia members operating in civilian clothing in cities and villages. Independent researchers speaking to Time Magazine claimed that the FARC-EP have 30,000 such militia members in 2011, indicating a shift in rebel strategy. ELN are estimated to have between 2900 and 5000 members as of 2010.

On 26 March 2008, Manuel Marulanda Vélez, the founder and leader of FARC, died of a heart attack and Cano succeeded him as commander-in-chief. During the same month two other members of the Secretariat, Raul Reyes and Ivan Rios were killed in action. In July 2008, the Colombian Army rescued fifteen of FARC's highest profile hostages, including Íngrid Betancourt in Operation Jaque, further weakening the rebels' position.

Cano was shot and killed by army forces on 4 November 2011 in the southwestern Cauca Department in what the Colombian government dubbed "Operation Odyssey." President Juan Manuel Santos confirmed his death on television, claiming the Colombian army dealt the FARC "the biggest blow in the history" of the guerrilla organisation. The FARC leader's death came months after he fled his stronghold in the south of Tolima, being pursued by armed forces since.

Inequity problems

Colombia has the fourth largest economy in Latin America, but income and wealth are unevenly distributed. In 1990, the income ratio between the richest and poorest 10% was 40-to-one, climbing to 80-to-one in 2000. In 2009, Colombia had a Gini coefficient of 0.587, one of the highest in Latin America, with 46% of Colombians living below the poverty line and 17% in "extreme poverty".

Taking better roads

Despite the grim history of corruption, war, drug cartels, guerrillas - the complete set of ills afflicting modern societies such as Mexico - Colombia has taken some steps that put them back on the international scene. They are modest progress in the struggle to defend human rights, as expressed by HRW. In terms of international relations has moved from a period of tense animosity with Venezuela, towards a prosperous outlook to further enhance integration. Colombia has also won a seat on the Security Council of the UN.

The world's second biggest bank HSBC has created a perspective on the economic outlook in 2050 where Colombia is seen playing a decisive role in the global economy, especially in the Americas as the number 25 in the world economies measured by GDP . This group has been called CIVETS. Today Colombia is the fourth largest oil producer in South America and it is estimated that by 2012, Colombia will be producing a million barrels a day.

Colombia lies at the crossroads of Latin America and the broader American continent, and as such has been hit by a wide range of cultural influences. Native American, Spanish and other European, African, American, Caribbean, and Middle Eastern influences, as well as other Latin American cultural influences, are all present in Colombia's modern culture. Urban migration, industrialization, globalization, and other political, social and economic changes have also left an impression.

Historically, the country's imposing landscape left its various regions largely isolated from one another, resulting in the development of very strong regional identities, in many cases stronger than the national. Modern transport links and means of communication have mitigated this and done much to foster a sense of nationhood, but social and political instability, and in particular fear of armed groups and bandits on intercity highways, have contributed to the maintenance of very clear regional differences. Accent, dress, music, food, politics and general attitude vary greatly between the Bogotanos and other residents of the central highlands, the paisas of Antioquia and the coffee region, the costeños of the Caribbean coast, the llaneros of the eastern plains, and the inhabitants of the Pacific coast and the vast Amazon region to the south east.

An inheritance from the colonial era, Colombia remains a deeply Roman Catholic country and maintains a large base of Catholic traditions which provide a point of unity for its multicultural society. Colombia has many celebrations and festivals throughout the year, and the majority are rooted in these Catholic religious traditions. However, many are also infused with a diverse range of other influences. Prominent examples of Colombia's festivals include the Barranquilla Carnival, the Carnival of Blacks and Whites, Medellín's Festival of the Flowers and Bogotá's Ibero-American Theater Festival

The mixing of various ethnic traditions is reflected in Colombia's music and dance. The most well-known Colombian genres are cumbia and vallenato, the latter now strongly influenced by global pop culture. A powerful and unifying cultural medium in Colombia is television. Notably, the telenovela Betty La Fea has gained international success through localized versions in the United States, Mexico, and elsewhere. Television has also played a role in the development of the local film industry.

As in many Latin American countries, Colombians have a passion for association football. The Colombian national football team is seen as a symbol of unity and national pride, though local clubs also inspire fierce loyalty and sometimes-violent rivalries. Colombia has "exported" many players, such as Freddy Rincón, Carlos Valderrama, Iván Ramiro Córdoba, and Faustino Asprilla. Other Colombian athletes have also achieved success, including Juan Pablo Montoya in Formula One Racing, Edgar Rentería and Orlando Cabrera in Major League Baseball, and the Camilo Villegas in professional golf.

Other famous Colombians include the Nobel Prize winning author Gabriel García Márquez, the artist Fernando Botero, the writers Fernando Vallejo, Laura Restrepo, Álvaro Mutis and James Cañón, the musicians Shakira, Juanes, Carlos Vives and Juan Garcia-Herreros, and the actors Catalina Sandino Moreno, John Leguizamo, Catherine Siachoque and Sofía Vergara.

The Colombian cuisine developed mainly from the food traditions of European countries. Spanish, Italian and French culinary influences can all be seen in Colombian cooking. The cuisine of neighboring Latin American countries, Mexico, the United States and the Caribbean, as well as the cooking traditions of the country's indigenous inhabitants, have all influenced Colombian food. For example, cuy or guinea pig, which is an indigenous cuisine, is eaten in the Andes region of south-western Colombia.

Many national symbols, both objects and themes, have arisen from Colombia's diverse cultural traditions and aim to represent what Colombia, and the Colombian people, have in common. Cultural expressions in Colombia are promoted by the government through the Ministry of Culture.

Popular culture

The depiction of Colombia in popular culture, especially the portrayal of Colombian people in film and fiction, has been asserted by Colombian organizations and government to be largely negative and has raised concerns that it reinforces, or even engenders, stereotypes, societal prejudice and discrimination due to association with poverty, narcotics trafficking, terrorism and other criminal elements. These stereotypes are considered unfair by many Colombians. The Colombian government funded the "Colombia es Pasión" advertisement campaign as an attempt to improve Colombia's image abroad, with mixed results.

Cuisine

Dishes & drinks from Colombia

Colombia's cuisine, influenced heavily by the Spanish and Indigenous populations, is not as widely known as other Latin American cuisines such as Peruvian or Brazilian, but to the adventurous traveler there are plenty of delectable dishes to try, not to mention fruits, rum, and especially Colombian coffee.

The geography of Colombia is characterized by containing five main natural regions that present their own unique characteristics, from the Andes mountain range region shared with Ecuador and Venezuela; the Pacific Ocean coastal region shared with Panama and Ecuador; the Caribbean Sea coastal region shared with Venezuela and Panama; the Llanos (plains) shared with Venezuela; to the Amazon Rainforest region shared with Venezuela, Brazil, Peru and Ecuador. Colombia is the only South American country which borders both the Atlantic and Pacific Oceans.

Colombia is bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by Panama and the Caribbean Sea; and to the west by Ecuador and the Pacific Ocean. Including its Caribbean islands, it lies between latitudes 14°N and 5°S, and longitudes 66° and 82°W

Part of the Ring of Fire, a region of the world subject to earthquakes and volcanic eruptions, Colombia is dominated by the Andes mountains (which contain the majority of the country's urban centres). Beyond the Colombian Massif (in the south-western departments of Cauca and Nariño) these are divided into three branches known as cordilleras (mountain ranges): the Cordillera Occidental, running adjacent to the Pacific coast and including the city of Cali; the Cordillera Central, running between the Cauca and Magdalena river valleys (to the west and east respectively) and including the cities of Medellín, Manizales, Pereira and Armenia; and the Cordillera Oriental, extending north east to the Guajira Peninsula and including Bogotá, Bucaramanga and Cúcuta. Peaks in the Cordillera Occidental exceed 13,000 ft (3,962 m), and in the Cordillera Central and Cordillera Oriental they reach 18,000 ft (5,486 m). At 8,500 ft (2,591 m), Bogotá is the highest city of its size in the world.

East of the Andes lies the savanna of the Llanos, part of the Orinoco River basin, and, in the far south east, the jungle of the Amazon rainforest. Together these lowlands comprise over half Colombia's territory, but they contain less than 3% of the population. To the north the Caribbean coast, home to 20% of the population and the location of the major port cities of Barranquilla and Cartagena, generally consists of low-lying plains, but it also contains the Sierra Nevada de Santa Marta mountain range, which includes the country's tallest peaks (Pico Cristóbal Colón and Pico Simón Bolívar), and the Guajira Desert. By contrast the narrow and discontinuous Pacific coastal lowlands, backed by the Serranía de Baudó mountains, are sparsely populated and covered in dense vegetation. The principal Pacific port is Buenaventura.

Colombian territory also includes a number of Caribbean and Pacific islands. This is considered by some as a sixth region, comprising those areas outside continental Colombia, including the department of San Andrés y Providencia in the Caribbean Sea and the islands of Malpelo and Gorgona in the Pacific Ocean. However, cultural ties are with the respective coastlines. In this region Colombia has a lot of stable sand banks of considerable size, considered suitable for the development of artificial islands.

Climate

The striking variety in temperature and precipitation results principally from differences in elevation. Temperatures range from very hot at sea level to relatively cold at higher elevations but vary little with the season. At Bogotá, for example, the average annual temperature is 15 °C (59 °F), and the difference between the average of the coldest and the warmest months is less than 1°C (1.8 °F). More significant, however, is the daily variation in temperature, from 5 °C (41 °F) at night to 17 °C (62.6 °F) during the day.

Colombians customarily describe their country in terms of the climatic zones: the area under 900 meters (2,953 ft) in elevation is called the hot zone (tierra caliente), elevations between 900 and 1,980 meters (2,953 and 6,496 ft) are the temperate zone (tierra templada), and elevations from 1,980 meters (6,496 ft) to about 3,500 meters (11,483 ft) constitute the cold zone (tierra fría). The upper limit of the cold zone marks the tree line and the approximate limit of human habitation. The treeless regions adjacent to the cold zone and extending to approximately 4,500 meters (14,764 ft) are high, bleak areas (usually referred to as the páramos), above which begins the area of permanent snow (nevado).

About 86% of the country's total area lies in the hot zone. Included in the hot zone and interrupting the temperate area of the Andean highlands are the long and narrow extension of the Magdalena Valley and a small extension in the Cauca Valley. Temperatures, depending on elevation, vary between 24 and 38 °C (75.2 and 100.4 °F), and there are alternating dry and wet seasons corresponding to summer and winter, respectively. Breezes on the Caribbean coast, however, reduce both heat and precipitation.

The cold or cool zone constitutes about 6% of the total area, including some of the most densely populated plateaus and terraces of the Colombian Andes; this zone supports about onefourth of the country's total population. The mean temperature ranges between 10 and 19 °C (50 and 66.2 °F), and the wet seasons occur in April and May and from September to December, as in the high elevations of the temperate zone..

Hydrology

The hydrography of Colombia is one of the richest in the world. Its main rivers are Magdalena, Cauca, Guaviare, and Caquetá. Colombia has four main drainage systems: the Pacific drain, the Caribbean drain, the Orinoco Basin and the Amazon Basin. The Orinoco and Amazon Rivers mark limits with Colombia to Venezuela and Peru respectively.

These are the main rivers confined to Colombia: Atrato, Cauca, Magdalena, Sinú, Baudó,, San Juan, Meta, Vichada. Colombia it's an important source of water, in its land born some several main rivers: Catatumbo, Arauca, Caquetá, Guainía, Putumayo River and Vaupés.

Environmental issues

The environmental challenges faced by Colombia are caused by both natural and human factors. Many natural hazards result from the geological instability related to Colombia's position along the Pacific Ring of Fire. Colombia has 15 major volcanoes, the eruptions of which have on occasion resulted in substantial loss of life, such as at Armero in 1985. Geological faults that have caused numerous devastating earthquakes, such as the 1999 Armenia earthquake. Heavy floods both in mountainous areas and in low-lying watersheds and coastal regions regularly cause deaths and considerable damage to property during the rainy seasons. Rainfall intensities vary with the El Niño-Southern Oscillation which occurs in unpredictable cycles, at times causing especially severe flooding.

Human induced deforestation has started to creep into the rainforests of Amazonia and the Pacific coast and has substantially changed the Andean landscape. Deforestation is also linked to the conversion of lowland tropical forests to oil palm plantations. However, compared to neighbouring countries rates of deforestation in Colombia are still relatively low. In urban areas, contamination of the local environment has been caused by human produced waste, and the use of fossil fuels. Participants in the country's armed conflict have also contributed to the pollution of the environment. Illegal armed groups have deforested large areas of land to plant illegal crops, with an estimated 99,000 hectares used for the cultivation of coca in 2007, while in response the government has fumigated these crops using hazardous chemicals. Insurgents have also destroyed oil pipelines creating major ecological disasters. Demand from rapidly expanding cities has placed increasing stress on the water supply as watersheds are affected and ground water tables fall. Nonetheless, Colombia is the fourth country in the world by magnitude of total freshwater supply, and still has large reserves of freshwater.