The document discusses the different natural regions of Colombia. It describes the Amazon region as covering 403,000 square kilometers in southern Colombia and comprising the departments of Amazonas, Caquetá, Guainía, Guaviare, Putumayo and Vaupés. The region is mostly covered by tropical rainforest and is part of the massive Amazon rainforest. It is bounded by the East Andes mountains and extends to the borders with Venezuela and Brazil.