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Lake Lanao
From Wikipedia, the free encyclopedia
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It has been suggested that Lanao be merged into this article or section. (Discuss) |
Lanao redirects here. This page refers to the lake. For the provinces, see Lanao del Norte and Lanao del Sur.
| Lake Lanao | |
|---|---|
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| Location | Lanao del Sur |
| Lake type | Rift Lake |
| Primary sources | 4 tributaries |
| Primary outflows | Agus River |
| Basin countries | Philippines |
| Max length | 33 km |
| Max width | 20 km |
| Surface area | 340 km² |
| Average depth | 60.3 m |
| Max depth | 112 m |
| Shore length1 | 115 km |
| Surface elevation | 700 m |
| Settlements | Lanao del Sur |
| 1 Shore length is not a well-defined measure. | |
Lake Lanao is a large lake in the Philippines, located in Lanao del Sur province in the country's southern island of Mindanao. With a surface area of 340 km². (131 square miles), it is the largest lake in Mindanao, and the second largest lake in the Philippines.
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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 two channels, one over the Maria Cristina Falls and the other over the Linamon Falls. A hydroelectric plant installed on the Lanao Lake and Agus River system generates 70% of the electricity used by the people of Mindanao.
The lake is home to 18 endemic species of freshwater fish and supports a large number of waterfowl. In October 2006, a study from the Mindanao State University discovered massive algae contamination in Lake Lanao. Initially, poor sewage and agricultural waste management were seen as the culprit to the contamination. However, the Department of Agriculture and the Bureau of Fisheries and Aquatic Resources stated that soil erosion from indiscriminate logging and extensive land use and farming are the problems that caused the algae contamination.
A Maranao myth describes the formation of the lake. It is said that a group of angels under the command of Gabriel removed the vast population of Mantapoli to prevent the world from tipping over. The hole that was left was filled with water and threatened to drown the rest of the world. In response, the angels enlisted the help of the Four Winds to gouge out an outlet. The hole became Lake Lanao and the outlet became the Agus river.
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