*The third basin is the '''Central Basin''', which is an endorheic basin (/13% of the territory). The ''Altiplano'' has large numbers of lakes and rivers that do not run into any ocean because they are enclosed by the Andean mountains. The most important river is the Desaguadero River, with a length of , the longest river of the ''Altiplano''; it begins in Lake Titicaca and then runs in a southeast direction to Poopó Lake. The basin is then formed by Lake Titicaca, Lake Poopó, the Desaguadero River, and great salt flats, including the ''Salar de Uyuni'' and Coipasa Lake.