Ratchaprapha Dam (Chieo Lan Dam)

Open Days: Daily

Opening Hours: 07.00 – 18.00

 

Ratchaprapha Dam, also widely known as Cheow Lan Dam, is one of Surat Thani’s most remarkable inland destinations. Located in Ban Ta Khun District, the site combines a major hydroelectric dam, an emerald reservoir, dramatic limestone karst scenery, a scenic dam crest viewpoint, boat piers, floating raft houses, restaurants, accommodation, and the lake zone of Khao Sok National Park. Its landscape is often called the “Guilin of Thailand” because of the towering limestone peaks rising directly from the green water.

 

The dam is located at 53 Moo 3, Khao Phang Subdistrict, Ban Ta Khun District, Surat Thani 84230. The dam and its visitor service areas are operated by the Electricity Generating Authority of Thailand, while much of the reservoir tourism area is connected with Khao Sok National Park. Visitors should understand the area in 2 main zones: the EGAT dam area, which includes the dam crest viewpoint, accommodation, restaurants, coffee shop, golf course, and landscaped public areas; and the lake zone, which includes long-tail boat trips, Khao Sam Kloe, floating raft houses, Coral Cave, Kraisorn Viewpoint, Nang Prai, Krai Son, Ton Toei, and Tham Nam Thalu when it is open.

 

Ratchaprapha Dam is a rockfill dam with a clay core. It was built across Khlong Saeng at Ban Chiao Lan in Khao Phang Subdistrict. The dam is about 94 metres high, with a crest length of about 761 metres, and the reservoir covers about 185 square kilometres. Construction began on 9 February 1982 and was completed in September 1987. The dam and hydropower plant were officially opened on 30 September 1987. The name “Ratchaprapha” means “Light of the Kingdom,” reflecting its role as a major energy and water-development project in southern Thailand.

 

The dam is important far beyond tourism. It generates hydropower, stores water for irrigation, helps reduce flood impacts during the rainy season, supports dry-season water management in the Tapi-Phum Duang river system, helps limit saltwater intrusion downstream, supports freshwater fisheries, and contributes to local tourism income. Its value therefore comes from the combination of engineering, energy, water management, local livelihoods, and outstanding natural scenery.

 

The easiest first stop is the Ratchaprapha Dam viewpoint. From this area, visitors can see the dam crest, the reservoir, surrounding hills, and landscaped green spaces. The viewpoint is suitable for walking, photography, relaxing, and paying respect to Phra Phuttha Siri Sattaraj, also known locally as Luang Pho Chet Kasat. It is a good option for travelers with limited time because it can be reached by road without taking a boat.

 

The core travel experience at Ratchaprapha Dam is a boat trip across Cheow Lan Lake. Boats depart from the Ratchaprapha Dam pier and travel through emerald water surrounded by steep limestone cliffs. The scenery changes constantly as boats pass narrow channels, open lake sections, raft houses, and forested cliff bases. Boat trips are available as half-day visits, day trips with lunch stops, or overnight journeys to floating raft accommodation.

 

The most iconic landmark is Khao Sam Kloe, a group of 3 limestone towers rising from the reservoir. This is the best-known photo spot of Cheow Lan Lake and one of the visual symbols of Surat Thani’s inland tourism. Morning often brings softer light and mist, while late afternoon gives warmer tones and stronger shadows. Visitors must travel by boat and should wear a life jacket at all times.

 

Coral Cave is another notable site in the lake zone. It is located in the 500-rai inner lake area and is managed under the Huai Tham Chan protection unit of Khao Sok National Park. The cave is known for limestone formations that resemble coral, created through mineral deposition over time. It is best visited as part of a guided lake trip, with current route conditions and access status checked in advance.

 

Tham Nam Thalu is one of the most adventurous cave routes in the Ratchaprapha lake zone. A stream flows through the cave, and the route requires walking through natural terrain before entering. Because the cave can become dangerous during the rainy season or when water levels rise, visitors must go with park staff or a qualified local guide. In 2026, Tham Nam Thalu is closed from 1 June to 30 November. Travelers visiting during that period should choose boat sightseeing, Khao Sam Kloe, kayaking, or raft-house stays instead.

 

Staying overnight on a floating raft house is one of the most memorable ways to experience Ratchaprapha Dam. Accommodation ranges from simple national-park raft houses to private floating resorts. Guests can kayak, swim in safe designated areas, take morning boat trips, watch mist drift over the lake, and enjoy the quiet of a place where phone signal and internet may be limited. It is a strong choice for travelers who want to disconnect and spend time close to nature.

 

For travelers who prefer land-based accommodation, Khun Saichol Villa and the EGAT guesthouse area offer rooms and houses near the dam. This option is convenient for families, elderly visitors, and travelers who want easy access to the viewpoint, restaurants, coffee shop, golf course, and pier without sleeping on the lake. Staying on land also makes it easier to manage early boat departures or short visits.

 

Dining options in the dam area include Krua Guilin, Krua Phum Duang, and Chala Thara by Khun Saichol coffee shop. These facilities allow visitors to eat or rest before and after their lake trip. Nearby Ban Ta Khun also has local restaurants serving southern Thai dishes and freshwater fish from the lake area. Visitors staying on floating raft houses normally eat at their accommodation or through the package they booked.

 

Getting There from Surat Thani city is by Highway 401 toward Ban Ta Khun. Follow signs to Ratchaprapha Dam and continue to the dam viewpoint or the pier, depending on the travel plan. The distance from Surat Thani city is roughly 70-90 kilometres depending on the starting point and route. Travelers arriving from Surat Thani Airport can use a rental car, van, private transfer, or local transport to reach Ban Ta Khun and the Ratchaprapha Dam pier.

 

The best time to visit depends on travel style. The late dry season and early dry months are popular for clearer weather and easier boat travel. The rainy season can be very beautiful, with lush forests and mist, but travelers must pay closer attention to rain, wind, cave closures, and boat safety. General boat sightseeing can operate when conditions are safe, but cave visits and hiking routes must follow park announcements and staff instructions.

 

The national park entrance fee for the Ratchaprapha Dam zone of Khao Sok National Park is 40 baht for Thai adults, 20 baht for Thai children, 300 baht for foreign adults, and 150 baht for foreign children. Boat fares and accommodation rates are charged separately according to route, boat type, raft house, and operator. Visitors should keep their national park ticket with them because officers may ask to check it inside the park zone.

 

Boat safety is essential. Visitors should wear life jackets throughout the boat journey, avoid standing on the bow while the boat is moving, keep arms and legs inside the boat, avoid swimming outside designated safe areas, and follow the boat operator’s instructions. If there is heavy rain, strong wind, or rough water, travelers should adjust the itinerary rather than force a route that staff do not recommend.

 

Responsible travel matters because Ratchaprapha Dam is part of a sensitive lake and forest landscape connected with Khao Sok National Park. Visitors should reduce single-use plastic, avoid littering, avoid throwing anything into the water, keep noise low, avoid disturbing wildlife, and use operators who follow park rules. Protecting the cleanliness and quiet atmosphere of Cheow Lan Lake helps preserve the experience for future visitors.

 

A complete visit to Ratchaprapha Dam should include more than a quick photo stop. The site is best understood through its dam history, hydropower role, water-management function, limestone landscape, national-park lake zone, floating raft houses, seasonal cave closures, and safety rules. This fuller understanding helps travelers plan better and appreciate why the dam is both an engineering landmark and one of southern Thailand’s most beautiful natural destinations.

 

Ratchaprapha Dam is therefore more than a scenic reservoir. It is a landscape where clean energy, water resources, rainforest, limestone mountains, lake tourism, and local livelihoods meet. A short day trip offers the beauty of the dam and Khao Sam Kloe, while an overnight stay reveals the silence of the lake, morning mist, and the slow rhythm of life surrounded by forest and cliffs. With proper planning and respect for nature, Cheow Lan Lake is one of the most complete travel experiences in Surat Thani.

 

 

A: Yes. Cheow Lan Dam is the former and widely used name, while Ratchaprapha Dam is the official royal name meaning “Light of the Kingdom.”

 

A: The main viewpoint and visitor service area are open daily from 07.00 to 18.00. Boat trips and raft-house stays follow operator schedules and weather conditions.

 

A: The Khao Sok National Park fee for the Ratchaprapha Dam zone is 40 baht for Thai adults, 20 baht for Thai children, 300 baht for foreign adults, and 150 baht for foreign children. Boat and accommodation costs are separate.

 

A: The main highlights are the dam viewpoint, Khao Sam Kloe, long-tail boat trips, limestone cliffs, floating raft houses, Coral Cave, and morning mist on Cheow Lan Lake.

 

A: No. In 2026, Tham Nam Thalu Cave is closed from 1 June to 30 November for safety and seasonal recovery.

 

A: A day trip is enough for the dam viewpoint, boat sightseeing, and Khao Sam Kloe. An overnight stay is better for morning mist, kayaking, quiet lake scenery, and a fuller Cheow Lan Lake experience.

 

A: Take Highway 401 toward Ban Ta Khun and follow signs to Ratchaprapha Dam. The distance is about 70-90 kilometres depending on the starting point and route.

 

A: Visitors should bring sun protection, a hat, sunglasses, a dry bag, quick-drying clothes, personal medicine, cash, and wear a life jacket whenever traveling by boat.