What is South America's largest lake, measured by volume?

Explanation

Lake Titicaca is located in the Andes mountains on the border between Peru and Bolivia. It sits 3,811 m above sea level, making it the world's highest lake with commercial ferry traffic. The lake covers an are of 8,372 km² and is South America's largest, measured by volume. According to old Inka legends both the sun and the moon were born on two islands in Titicaca.