Most of South America’s important lakes are confined to the Andes or their foothills. Because of the chain’s complex topography, water has accumulated in closed basins to form natural reservoirs. Among permanent Andean lakes, the largest is Lake Titicaca, which lies at an elevation of 12,500 feet between Peru and Bolivia. The lake is 120 miles long and up to 50 miles wide, although it was much more extensive in the past. Lake Junín in central Peru; Lake Sarococha, also in Peru, between Puno and Arequipa; and Lake Poopó in Bolivia also rank among the larger Andean lakes. They exhibit uniform physical conditions throughout the year, in terms of temperature and percentage of dissolved gases. In addition, they remain ice-free up to an elevation of 16,000 feet, and, as a result, the climate of their shores is temperate.
Piedmont lakes are found in Patagonia where, in the wake of melting glaciers, lakes formed downslope in natural basins. Among these are Lakes Buenos Aires, Argentino, and Nahuel Huapí. Their eastern parts, which stretch to the end of the Argentine plateau, generally have gently sloping banks bordered by low mountains, while their western parts form a series of narrow, fjordlike arms that lie between steep slopes. Bodies of water such as Lake Maracaibo in Venezuela and Dos Patos Lagoon in southern Brazil, both located on coasts, formed when longshore drifts sealed the exits to the sea. "South America" © Emmanuel BUCHOT, Encarta, Wikipedia
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