Ratchaprapa Dam or Chiao Lan reservoir was built in 1982 under the supervision of Khao Sok National Park and Provincial Electricity Authority to provide hydro-electricity to Surat Thani city and other nearby towns. When water filled the dam over 100 islands formed; many of them are stunning pillars rising upright against the bright blue sky. The mysterious and charming scenery makes us all gaze on in awe at the beauty of the exotic sights surrounding us.