BALLIVIN, LAKE

predecessor to modern Lake Titicaca, on the Bolivia-Peru border during Pleistocene times (1,600,000 to 10,000 years ago). Its surface is thought to have been at least 330 feet (100 m) above the present surface of Lake Titicaca. As the lake drained, it formed two smaller lakes: Titicaca, in the northern portion of its basin, and Minchin, predecessor to modern Lake Poop, in the southern.