Cheow Lan Lake

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Cheow Lan Lake
Khao Sok Lake Map.jpg
Cheow Lan Lake Map showing available Hikes, Caves and Floating Bungalows
LocationSurat Thani Province, Thailand
Coordinates8°58′36″N 98°48′16″E / 8.97667°N 98.80444°E / 8.97667; 98.80444Coordinates: 8°58′36″N 98°48′16″E / 8.97667°N 98.80444°E / 8.97667; 98.80444
First flooded1987
Surface area185 square kilometres (71 sq mi)

Cheow Lan Lake[a] (Thai: เชี่ยวหลาน, RTGSChiao Lan) or Rajjaprabha Dam Reservoir (อ่างเก็บน้ำเขื่อนรัชชประภา, RTGS: Ratchaprapha~), is in Khao Sok National Park in Surat Thani Province, Thailand. It is an 185-square-kilometre (71 sq mi) artificial lake, inaugurated in 1987 with the construction of Rajjaprapha Dam by the Electricity Generating Authority of Thailand (EGAT) as a source of electricity.[1]

Cheow Lan Lake
Evidence of the preexisting forest

Rajjaprabha Dam[edit]

Rajjaprabha Dam, meaning 'light of the kingdom', got its name in May 1987 from the king at the opening ceremony on the king's 60th birthday. Before that day it was called the "Cheow Lan Project". It was designed as a multi-purpose project for power generation, flood control, irrigation, and fishery. In 1982, the Electricity Generating Authority of Thailand (EGAT) started construction of the dam by diverting the Klong Saeng River. It took about one year to completely flood the 185 square kilometres (71 sq mi) basin. To flood this large area, 385 families of Ban Chiew Lan village were resettled. Rubber and other farming opportunities such as poultry, fruit orchards, vegetable farming, and reservoir fisheries were introduced together with the needed training programs and credit facilities to sustain farmers' incomes.

Each family received 19 rai (7.2 acres) of rubber plantation as well as one rai (0.39 acres) for their dwelling. As part of the compensation, the resettled people received 1,000 baht monthly per family. Resettlement drove the creation of basic public infrastructure, water supply systems, and public buildings such as schools, police station, medical center, and community hall—all built by the Thai government.

A resettlement of animals took place by boat and helicopter to prevent them from drowning or starving on new created islands. In 18 months 1,364 animals of 116 species were rescued, but 44 died soon after.[2] Many fish species died due to the stagnant water conditions.


The national park area is inhabited by a range of mammals such as tigers, elephants, tapirs and many monkey species. Birds such as hornbills, banded pittas, and great argus are as well forest residents. Less commonly seen reptiles include the king cobra, reticulated python, and flying lizards. The reservoir area includes the Khlong Saeng, Khlong Nakha and Kaeng Krung wildlife sanctuaries where rare animals can be found. West of Khao Sok National Park lies Sri Phang Nga National Park which extends the preservation area to 4,000 square kilometers.

Dusky langur
Kayaking on Cheow Lan Lake
Island, Cheow Lan Lake
Sunriese at Cheow Lan Lake
Kri Sorn Ranger Station at Cheow Lan lake.


  1. ^ Also spelled Chiew Lan or Chiew/Cheow Larn


  1. ^ "Rajjaprabha Dam". Electricity Generating Authority of Thailand (EGAT). Retrieved 2018-02-12.
  2. ^ Nakhasathien, Seub (July 1989). "Chiew Larn Dam Wildlife Rescue Operation". Oryx. 23 (3): 146–154. doi:10.1017/S0030605300022870. ISSN 1365-3008.

External links[edit]