Cheow Lan Lake or Rajjaprabha Dam Reservoir, is in Khao Sok National Park in Surat Thani Province, Thailand. It is an 185-square-kilometre artificial lake, inaugurated in 1987 with the construction of Rajjaprabha Dam by the Electricity Generating Authority of Thailand as a source of electricity.
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Coordinates 9°2'50.586" N 98°40'33.378" E