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In page Mindanao:

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Lake Lanao occupies a large portion of one such plateau in Lanao del Sur. This lake is the largest lake in Mindanao and the second largest in the country; it is roughly triangular in shape with an 18-mile-long (29 km) base, having a surface at 780 meters above sea level, and is rimmed on the east, south, and west by a series of peaks reaching 2,300 meters.[citation needed] Marawi City, at the northern tip of the lake, is bisected by the Agus River, that feeds the Maria Cristina Falls.