Lake Lanao, Lanao del Sur

The lake was formed by the tectonic-volcanic damming of a basin between two mountain ranges and the collapse of a large volcano. It has a maximum depth of 112 meters, and a mean depth of 60.3 meters. The basin is shallowest towards the north and gets progressively deeper towards the south. The lake is fed by four rivers. Its only outlet is the Agus River, which flows southwest into Iligan Bay via