The lake formed by the Ratchaprapha Dam is entirely man-made, created in 1982 by submerging a large valley, which resulted in the unique submerged forest stumps and karst islands visible today.
The water in the reservoir is exceptionally clear due to the lack of sediment runoff, allowing for significant underwater visibility.
The dam itself provides hydroelectric power for the Surat Thani province.
The limestone karsts visible from the marina are older than the Himalayan mountain range.
Ratchaprapha Marina serves as the primary gateway for boat access to Cheow Lan Lake within Khao Sok National Park. It is situated at the base of the Ratchaprapha Dam, which is an earth-fill structure forming a massive reservoir surrounded by towering limestone karst formations. The marina functions as a transit hub where visitors board long-tail boats to reach floating raft houses located deep within the park. The water at the marina is characterized by its deep emerald-green color, a result of the lake's depth and mineral content. Boats departing from this pier provide the only practical means to explore the interior rainforest, caves, and wildlife habitats of the reservoir.
The elevated viewing area near the main pier provides a panoramic view of the dam wall contrasting with the sprawling reservoir and karst mountains.
Bring a waterproof dry bag for your electronics and belongings to protect them during the boat ride.
Ensure you have a national park permit before departing, as you will be entering a protected area immediately upon leaving the pier.
Wear a hat and high-SPF sunscreen, as there is limited shade once you board the open-air long-tail boats.
Do not attempt to swim near the busy boat docking area due to active propeller traffic. Avoid arriving without pre-booked boat arrangements, as independent long-tail boat hire can be difficult to negotiate on-site.
Maintain a quiet environment to avoid disturbing wildlife and local boat operators. Ensure your attire is respectful when boarding, as this is a gateway to a protected natural park.
