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Agus River is a river that flows for 36.5 km from Lanao Lakemarker to Iligan Baymarker, Philippinesmarker. It cuts through the provinces of Lanao del Surmarker and Lanao del Nortemarker. Settlements along the banks of the river include the City of Marawimarker, the Municipality of Linamonmarker and the City of Iliganmarker. It separates into two channels as it drains to Iligan Bay; one going over the Maria Cristina Fallsmarker while the other supplies the Linamon Falls. The river descends for about from its source as it flows for before draining to the sea. The river is relatively shallow as it is only deep in some areas. The Agus River's watershed spans about 11,320.00 hectares. In 1992, the National Power Corporation financed the reforestation of the Lake Lanao-Agus River watershed, planting over 1500 hectares of Acacia mangium, Durio zibethinus and other indigenous trees. It has a discharge of about 10 second-meters and flows from a narrow depression off the northwestern rim of the lake and flows over a basalt rock formation. The canyon carved by the river suggests a short erosional period.

Importance to humans

The lake and the river are used for both commercial and sport fishing, as well as for recreational activities such as boating and swimming. The river in its entirety, however, is not navigable because the current in some areas reaches a velocity of up to thirty miles an hour. Together with Lanao Lake, the Agus River generates 70% of the electricity used in Mindanao due to the hydroelectric plants in the river and Maria Cristina Falls. However, the hydroelectric plants and the requisite regulatory dams have changed the fluctuations of the water level of Lake Lanao, affecting the indigenous people, producing conflicts with the local population.

In Maranao mythology, Lake Lanao once threatened to drown the people of Sebangan with its ever-rising waters. The Archangel Gabriel is thought to have made the Agus river in order to drain the lake.


  1. "Principal River Basins of the Philippines", Published by the National Water Resources Board, October 1976 (p. 12)

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