The reservoir was created by flooding a large valley, permanently submerging the former village of Ban Cheow Lan.
The reservoir's limestone cliffs are part of a geological formation estimated to be 250 to 400 million years old.
Rajjaprabha translates to 'The Light of the Kingdom', a name bestowed by King Rama IX.
The lake contains 'Khao Sam Kloe', a famous set of three limestone pillars that rise vertically from the water.
The dam is part of a complex that integrates power generation with large-scale wildlife conservation efforts.
Rajjaprabha Dam, also known as Cheow Lan Dam, is a 94-meter-high rockfill dam completed in 1987 in the Surat Thani province of Thailand. The facility creates a massive reservoir spanning 185 square kilometers, characterized by limestone karst formations protruding from the water. The dam serves primarily for hydroelectric power generation, irrigation, and flood control within the Khao Sok National Park region. Visitors access the reservoir via the dam’s pier to reach floating raft houses located deep within the lake. The reservoir's depth reaches up to 100 meters in certain areas, providing a habitat for diverse freshwater fish and wildlife species. It serves as the main gateway to the pristine interior rainforests of the surrounding protected areas. The dam structure itself acts as a massive vantage point overlooking both the reservoir and the lush valley downstream.
The viewpoint located near the dam crest providing a panoramic perspective of the reservoir and the karst mountains.
Bring a waterproof bag for electronic devices if you plan to board a long-tail boat.
Carry a valid photo ID as it is often required at security checkpoints before reaching the pier.
Prepare for high humidity and minimal shade once out on the water.
Attempting to swim in the reservoir without a life jacket or away from designated swimming zones.
Maintain a quiet volume to avoid disturbing the wildlife; modest dress (shoulders and knees covered) is recommended if visiting nearby local communities.
