Ratchaprapa Dam is located in Khao Sok national park in Surat Thani province in the Southern part of Thailand, a short one hour drive from Surat Thani airport. It was built in 1982 under the supervision of Khao Sok National Park and Provincial Electricity Authority to provide hydroelectricity to Surat Thani city.
The damming of the Khlong Saeng River by the massive 94m Ratchaprapha Dam formed a gigantic 165 square kilometer lake surrounded by huge mountain ranges consist mainly of limestone which leads to the notable Karst geography of the surrounding mountains and hills.
Ratchaprapa Dam is an extremely large body of water covering an area of 165 square kilometers. The lake has numerous islands, inlets and bays lined by twisted root systems in addition to varying depths to 30m’s. Some 60 million years’ worth of water erosion on limestone mountains results in the unforgettable vistas that this park offers. In the distant hills one can see more rainforest but the sheer survival instincts of the foliage growing from water level up is amazing to behold. It has been subject to a high degree of protection by the Thai government.Khao Sok National Park and Ratchaprapa Dam are possibly the most beautiful and unspoilt fishing locations in Thailand affording the angler some of the most beautiful scenery and abundance of wildlife to be found in South East Asia. Ratchaprapa Dam is bordered by some of the most impressive scenery with several lime stone caves bordering its banks.