Lake Titicaca is a large freshwater lake in the Andes mountains on the border of Bolivia and Peru. It is often called the highest navigable lake in the world. By both volume of water and by surface area, it is the largest lake in South America.

Lake Titicaca has a surface elevation of 3,812m (12,507ft). The "highest lake" claim is generally considered to refer to commercial craft. Numerous smaller lakes around the world are at higher elevations. For many years, the largest vessel afloat on the lake was the 2,200-ton (2,425 U.S. tons), 79m (259ft) SS Ollanta. Today, the largest vessel is most likely the similarly sized train barge/float Manco Capac, operated by PeruRail.