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Titicaca Lake in the Andes on the Peru-Bolivia border, draining s through the River Desaguader into Lake Poopó. At an altitude of 3810m (12,500ft), it is the world's highest navigable body of water. The constant supply of water has enabled the region to grow crops since ancient times. The lake is home to giant edible frogs, and is famed for its totora reeds, from which the Uru make their floating island homes and fishing rafts. Area: 8290sq km (3200sq mi); max. depth 280m (920ft).