Lake Lanao
Lake Lanao (Maranao: Ranao or Ranaw;Filipino: Lawa ng Ranao), is a large ancient lake in the province of Lanao del Sur, Philippines. With a surface area of 340 km2 (130 mi2), it is the largest lake in Mindanao, the deepest and second largest lake in the Philippines, and counted as one of the 15 ancient lakes in the world.