Geography of South America world by drainage area—the Amazon River and the more southerly Paraná River. The other major river of this central lowland is the Orinoco River, which has a natural channel linking it with the Amazon. Most of this central lowland is sparsely populated because the soils are heavily leached, but in the south is the very fertile pampas of Argentina—one of the world's major food-producing regions where wheat and beef cattle are pre-eminent. The natural vegetation of the northern lowlands are either savanna in the northern "llanos" and southern "campos", or tropical rainforest throughout most of the Amazon basin. Efforts to
South America the G8+5 (the most powerful and influential nations in the world). In the tourism sector, a series of negotiations began in 2005 to promote tourism and increase air connections within the region. Punta del Este, Florianópolis and Mar del Plata are among the most important resorts in South America. The most industrialized countries in South America are Brazil, Argentina, Chile, Colombia, Venezuela and Uruguay respectively. These countries alone account for more than 75 percent of the region's economy and add up to a GDP of more than US$3.0 trillion. Industries in South America began to take on the economies of