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 American Youth Football Championship limit was raised to 20. This change was made in order to use the competition as South American qualification for the FIFA World Youth Championship (now renamed the FIFA U-20 World Cup), held every two years since 1977. The most recent edition (number 28) was hosted by Ecuador and won by Uruguay in 2017. The Championship has had only five champions during its history (Brazil, Uruguay, Argentina, Colombia and Paraguay). However, since 1983, Brazil has largely dominated the tournament, sharing the trophy only on three occasions with Colombia and on four occasions with Argentina. All matches take place in the