Even though Lake Titicaca has a much larger area, its eastern half is located on Bolivian territory.

In years of abundant rains, fluctuations in the water level are moderate, but in years of drought water level may drop 1.5–2 m (4.9–6.6 ft) leaving extensive areas exposed.

The deepest part of the lake, which is located about 10 kilometres (6.2 mi) off Huayre, is 12 m (39 ft) deep.

Sewage coming from the towns of Junin and Carhuamayo also pollutes the lake.

[1][10] Lake Junin is surrounded by emergent vegetation, which in some places can reach 6 km (3.7 mi) wide and become so dense that it is impenetrable.