Geography of South America Great American Interchange. The Andes, likewise a comparatively young and seismically restless mountain range, runs down the western edge of the continent; the land to the east of the northern Andes is largely tropical rain forest, the vast Amazon River basin. The continent also contains drier regions such as eastern Patagonia and the extremely arid Atacama desert. The South American continent also includes various islands, most of which belong to countries on the continent. The Caribbean territories are grouped with North America. The South American nations that border the Caribbean Sea—including Colombia, Venezuela, Guyana, Suriname, and French Guiana—are also known
South America high biodiversity, containing a major proportion of the Earth's species. Brazil is the largest country in South America, encompassing around half of the continent's land area and population. The remaining countries and territories are divided among three regions: The Andean States, the Guianas and the Southern Cone. Traditionally, South America also includes some of the nearby islands. Aruba, Bonaire, Curaçao, Trinidad, Tobago, and the federal dependencies of Venezuela sit on the northerly South American continental shelf and are often considered part of the continent. Geo-politically, the island states and overseas territories of the Caribbean are generally grouped as a part