Quibdó (.mw-parser-output .IPA-label-small{font-size:85%}.mw-parser-output .references .IPA-label-small,.mw-parser-output .infobox .IPA-label-small,.mw-parser-output .navbox .IPA-label-small{font-size:100%}Spanish pronunciation: [kiβˈðo]) is the capital city of Chocó Department, in the Pacific Region of Colombia, and is located on the Atrato River. The municipality of Quibdó has an area of 3,507 km² and a population of 129,237,[2] predominantly Afro Colombian, including Zambo Colombians. [3] In prehistoric times the Chocó rainforest and mountains constituted a major barrier dividing the Mesoamerican and Andean civilisations. The high rainfall and the extremely humid climate did not attract the Spanish colonists. The Emberá Indians ceded much of their territory to the Spanish Franciscan order in 1648. Subsequent attacks on colonial outposts by hostile tribes discouraged attempts at settlement.[4] Six years later, the Spanish began again to colonize the region, eventually establishing some lumber camps and plantations where they used enslaved Africans as workers. It was not until the nineteenth century when there was interest in finding a shipping route between the Atlantic and Pacific Oceans to avoid traveling via the Straits of Magellan that the Chocó region again became of significant interest to European colonial powers, as the Atrato River Valley was thought the best possibility for this purpose by the explorer Alexander von Humboldt;[5] however this idea was eventually shelved in favour of the Panama Canal. At the same time that research on using the Chocó to connect the Pacific and Atlantic was being carried out, gold and platinum were discovered in the Atrato Valley[5] and this ensured Quibdó’s growth and status as the chief town in the region.