What shouldn’t be missed for a Khao Sok trip is Ratchaprapha Dam or Cheow Lan Dam or Lake Khao Sok. Completed in 1987 the dam serves as the hydroelectric power generator. As a result, it also creates a beautiful gigantic reservoir with a large number of towering limestone mountains and small and large islands which once were limestone peaks. Moss underneath the deep water enhances the emerald green colour of water in the lake making it looks more like sea water. The topography of the lake is similar to that of Guilin in China, hence the reservoir is given the name “Guilin of Thailand”.