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Lake Lanao (Maranao: Ranao or Ranaw)[1] 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 (130 sq mi),[1] it is the largest lake in Mindanao, and the second largest lake in the Philippines and counted as one of the 15 ancient lakes in the world.

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