Lake Maninjau (Danau Maninjau, Meninjau means Overlook or Observation ) is a caldera lake in West Sumatra, Indonesia. It is located 16 km to the west of Bukit Tinggi. Lake Maninjau has an area of 99.5 km², being approximately 16 km long and 7 km wide. The average depth is 105 m, with a maximum depth of 165 m. The natural outlet for excess water is the Antokan river, located on the west side of the lake. Since 1983 this water has been used to generate hydroelectric power for West Sumatra. Most of the people who live around Lake Maninjau are ethnically Minangkabau.