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
Argentina–Uruguay football rivalry side of the Río del Plata. The Copa Premier Honor Argentino was held in Buenos Aires (it was played until 1920) while the Copa Premier Honor Uruguayo (1911-1924) was always held in Montevideo. In 1910, the Copa Centenario Revolución de Mayo was played as part of the celebrations for the May Revolution in Argentina. The competition is notable for being the first international tournament of South America where more than two football nations participated. The "Copa Centenario" is also considered a predecessor to Copa América. Teams were Argentina (champion), Uruguay and Chile. Because of having featured three of the subsequent