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
Sport in Uruguay in the Maldonado department, is regularly included in the South American Rally Championship. The two major purpose-built circuits are El Pinar and Mercedes, whereas several cities have hosted street races, including Montevideo, Punta del Este, and Piriápolis. Major Argentine and South American road course championship series have raced at those places, most notably the Turismo Carretera, TC 2000, Top Race, and Formula Three Sudamericana, and also international karting and motorcycling events. Conversely, Uruguayan drivers have raced in Argentina, most recently Juan Cáceres and José Pedro Passadore. Currently, Uruguay has national championships for road course racing (both automobiles and motorcycles), rallying,