Planning a Trip to Cheow Lan Lake? Here’s the Ultimate Guide
Introduction: What’s in this guide?
Planning a trip to Cheow Lan Lake (also known as Khao Sok Lake or Cheow Larn Lake) in Khao Sok National Park? This updated and detailed guide includes everything you need to know before planning an unforgettable trip to this hidden gem in Southern Thailand. From enjoying a peaceful night of relaxation in one of the lake’s famous floating bungalows to embarking on jungle treks and cave explorations, Cheow Lan Lake offers a perfect blend of leisure and adventure for every kind of traveler.
Ideal for those looking to explore the jungle, lake, and national park even deeper. Here, you’ll be able to examine your itinerary options, whether you’re coming for a day trip, an overnight stay, or a multi-day eco-adventure. We include in-depth descriptions, estimated costs, and local tips and tricks you won’t find anywhere else.
Here's what you'll learn
- Key facts about the geography, history, and wildlife of Cheow Lan Lake and Khao Sok National Park.
- How to get to Cheow Lan Lake and easily navigate the park.
- Park rules and entrance fees to avoid unexpected costs.
- Best time to visit for weather, wildlife, and fewer crowds.
- Trip options: day tours and overnight stays (plus their pros and cons)
- Top activities on the lake.
- What to expect when staying in a floating bungalow.
- A packing checklist.
- Advice for families travelling with children and accessibility considerations.
- Answers to FAQs
Cheow Lan Lake Quick Facts and Overview
Often described by travelers as the highlight of their entire trip to Thailand, Cheow Lan Lake offers a fantastic blend of adventure, relaxation, and unique natural beauty. Below, we’ll outline what makes the destination so special, from its geological origins to the thriving present-day ecosystem.
The geography of Cheow Lan Lake
Cheow Lan Lake, also known as the Ratchaprapha Dam Reservoir, spans approximately 165 km2 with an average depth of 40 meters and a maximum depth of 90 meters. It lies on the northern border of the 739 km2 Khao Sok National Park in the Surat Thani Province of Southern Thailand. The lake also borders the Khlong Saeng, Sri Phang Nga, and Khlong Yan wildlife sanctuaries, though it is most associated with and accessed through the National Park.
How to get to Cheow Lan Lake from nearby towns:
- 90km from Surat Thani town and airport.
- 60km from Khao Lak.
- 180km from Phuket and airport
- 150km from Krabi and airport
Map showing Cheow Lan lake and nearby airports and cities
What is the area best known for?
- Hundreds of dramatic limestone karst, rising 300-600 meters high.
- Unique and diverse wildlife inhabiting the lake and the surrounding rainforest.
- The lake’s clear emerald waters.
- The unforgettable experience of staying overnight in a floating bungalow.
Natural History
The creation of the breathtaking mountainous karst landscape we know today did not occur overnight. Over the course of millions of years, there have been dramatic changes to the ecosystem and topography that we know today as Khao Sok National Park and Cheow Lan Lake.
- Permian Period (over 225 million years ago): the entire region was underwater and made up of a vast coral reef system that, along with sinking calcareous plankton, accumulated large carbonate deposits. As the Ice Age was ending, increased rainfall caused increased sedimentary rock sedimentation on top of the carbonate layer. The high-pressure system that resulted metamorphosed the carbonate deposits to limestone rocks.
- Cretaceous Period (135-66 million years ago): underground volcanic activity led to large granitic intrusion in the limestone that at this point was still the sea floor.
- Tertiary Period (66-3 million years ago): the Himalayas arose from the collision of the Indian and Eurasian tectonic plates. This powerful event also uplifted the limestone, granite, and sandstone rocks that made up the seafloor, now exposing them to air and rainfall.
- Present-day: due to the chemical structure of limestone, it is easily eroded by rainfall and river waters. This is what created the karst landscape in this region that we know and love today.
The creation of Cheow Lan Lake and life before the dam
Khao Sok National Park’s rainforest is over 160 million years old, while Cheow Lan Lake has been around for just 38 years. The Electricity Generating Authority of Thailand (EGAT) started building the Ratchaprapha Dam on the Klong Saeng River in 1982. The completion of the dam in 1987 led to the flooding of the valley, which resulted in the creation of the present-day lake.
The lake before tourism
Ratchaprapha Dam
The rockfill clay-core dam is quite impressive:
- 95 meters tall
- 761 meters long
- Generating capacity of 240 MW
- Producing 554 million kWh of electricity annually
It contributes to Thailand’s national grid and supports the nearby communities' power needs.
Other benefits of the Ratchaprapha dam:
- Flood control: during the rainy season, the dam stores excess water in the Cheow Lan Lake reservoir, reducing the risk of flooding in the surrounding areas.
- Irrigation: water from the reservoir supports the agriculture of nearby farms during the dry season.
- Fisheries: The reservoir has become an important freshwater fishery, producing around three hundred tons of fish and shrimp annually (EGAT).
- Tourism: The creation of the lake sparked a booming eco-tourism industry, particularly centered around the lake’s famous floating bungalow accommodation and associated tours, creating new jobs for local communities.
- Environmental benefits: EGAT also reports that the dam helps mitigate saltwater intrusion and assists with wastewater treatment and dilution in the river system.
Social and Environmental Impacts
However, this transformation came with significant social and ecological costs. The area was once home to the village of Ban Chiew, which now sits on the lake floor. Around 385 families had to leave their homes. Each family received a rubber plantation plot, a piece of land, and a monthly allowance of 1,000 baht. The Thai government also established schools and a medical center to assist in the community’s resettlement.
Many of the animals from the valley were moved to a different location. In a period of 18 months, more than 1,300 animals from 116 distinct species were captured and then released into local protected areas. However, the World Bank reported that around fifty-two species of fish were unable to adapt to the new, deeper aquatic environment. Even now, when boating on Cheow Lan Lake, you can spot the eerie remains of the old forest, a striking testament to how much the area has changed.
Wildlife You Can Spot Today at Cheow Lan Lake
Although the creation of the dam caused habitat changes that some species were unable to adapt to, the rainforest surrounding Cheow Lan Lake remains one of the most biodiverse ecosystems in the world. Researchers estimate that more than 5% of all species identified on Earth are found in this region. A countless variety of mammals, reptiles, amphibians, birds, insects, and fish call the jungle their home.
While boating or kayaking, you can often spot macaques swinging between the trees and hear the hauntingly distinct morning calls of gibbons echoing across the lake. If you’re lucky, you may get the opportunity to observe a wild elephant or Malayan tapir taking a drink from the water’s edge. This incredible diversity makes Khao Sok National Park and Cheow Lan Lake an animal lover's paradise.
Access to The Lake and Navigating the Park
Most visitors choose to begin their journey in Khao Sok Village, around a 1-hour drive away from the Ratchaprapha Pier. The pier is the only entry point for tourists and is where all tours and boat transfers depart. One of the reasons Khao Sok National Park is such a popular destination is due to its ease of accessibility from anywhere in Southern Thailand. Travelers most commonly arrive from one of the nearby towns of Krabi, Surat Thani, or Phuket, all of which have airports and convenient ground connections.
The easiest way to reach Khao Sok Village is by private taxi or shared shuttle organized through your accommodation or reliable travel sites like 12Go Asia.
There are always two main parts to reaching your floating bungalow or day-trip destination on Cheow Lan Lake. The first involves overland travel to the Ratchaprapha Pier, and the second is a scenic traditional Thai longtail boat transfer.
Step 1: Overland Travel to Ratchaprapha Pier
- Shuttle transfers (bus or minivan): the most common and budget-friendly option. Your accommodation or tour provider typically arranges this.
- Private taxis: ideal for those who prefer flexibility, privacy, and direct travel. While more expensive, it can often be the best option for those who decide not to stay in the Khao Sok Village and want to travel directly to Cheow Lan Lake from one of the other nearby cities.
- Note: There are currently no public transportation options to go to the pier.
Step 2: Longtail Boat Transfer on Cheow Lan Lake
Once you arrive by land at the Ratchaprapha Pier, everyone will continue their journey via a traditional Thai longtail boat, driven by a seasoned local guide. These boats transport guests to their respective floating bungalows or activity sites around the lake. Most raft houses are between a 1-and 2-hour boat ride from the pier, but the beautiful scenic views make it go by fast.
Private boat tours can also be arranged upon request.
If you’ve booked a day trip or overnight bungalow stay through one of the many touring companies or accommodations, round-trip transportation (including the boat ride) is usually included in the package
Park Rules and Entrance Fees - Avoid Unexpected Costs
Khao Sok National Park is open year-round between 6:00 a.m. and 6:00 p.m. daily. Access to Cheow Lan Lake is only permitted during these hours, unless you are staying overnight at an authorized floating bungalow.
Notes:
- Guided night safaris are restricted to the Khao Sok Village area and are not permitted near the lake.
- For safety and conservation reasons, boats are not allowed to operate in the park between sunset and sunrise.
- Hiking anywhere within the National Park requires a licensed guide except for a few short, designated trails. Hiking independently in the jungle can be extremely dangerous due to the rugged terrain and the presence of venomous wildlife such as cobras and vipers.
Upon arrival at the Ratchaprapha Pier, foreign visitors will pay a National Park Entrance Fee of:
- 340 Baht per adult
- 170 Baht per child (ages 3-14)
For Thai citizens, the fee is:
- 40 Baht per adult
- 20 Baht per child (ages 3-14)
Certain activities, such as a trip to the Coral Cave, require an additional entrance fee of 200 Baht per person.
Carrying extra cash is recommended, since, like elsewhere in Thailand, card payments might not always be accepted.
Best Time to Visit for Weather, Wildlife, and Fewer Crowds
Temperatures in Khao Sok National Park typically range between 22-33℃, and the air remains humid year-round due to the dense rainforest environment. The surrounding greenery helps keep the climate milder and more comfortable than other parts of Southern Thailand, though you should always be prepared for rain at any time of year (it is a rainforest, after all).
In terms of weather, Thailand is divided into three main “seasons” that you need to consider when planning your visit:
- Dry season (December to April): This is the sunniest time of year, with higher temperatures and reduced rainfall. It’s also the peak tourist season, so expect larger crowds and book your accommodation in advance, as floating bungalows and tours tend to fill up much more quickly.
- Rainy season (July to October): These months truly put the “rain” in rainforest. Expect hot, humid days with short but intense afternoon or evening downpours. The benefit? Fewer tourists and a lush, vibrant jungle at its greenest.
- Shoulder months (May, June, and November) offer a balance between good weather and fewer crowds, these months bring occasional showers but also lower prices, better availability, and fewer crowds.
Chart showing average monthly temperature and rainfall in Khao Sok
Cheow Lan Lake Trip options
Although multi-night and custom itineraries are available most people will opt for a day or overnight trip.
Day Tour
A typical day tour would include a long-tail boat cruise through the lake with a stop for lunch and relaxation at a floating raft house.
You might visit a cave or waterfall along the way.
| Pros | Cons |
Overnight Stay (2D/1N)
- Day 1: Take the longtail boat ride through limestone karst scenery. Lunch and dinner at the raft house and fun swimming and kayaking. You will also be able to join an evening safari by boat to spot wildlife and enjoy spectacular views.
- Day 2: Get up early and take a boat trip to experience the wildlife and views at sunrise - not to be missed! Return for breakfast and lunch while relaxing, swimming and kayaking. In the afternoon return to the pier by longtail boat arriving late afternoon.
| Pros | Cons |
Experience the unique tranquility of the lake in the evening and early morning once the day-trippers leave | Basic amenities - simple rooms, limited electricity, and sometimes shared bathrooms |
Activities Available on Cheow Lan lake
- Swimming in the clear emerald waters
- Kayaking or canoeing around the raft houses and more adventurous exploration of the lake.
- Hiking to viewpoints, caves, and waterfalls
- Boat trips for sightseeing
- Wildlife spotting
- Overnight stays in floating bungalows
Staying at the Floating Bungalows
The raft houses are comfortable but provide basic accommodation. While more luxurious bungalows are being developed you should expect:
- Shared bathrooms
- Basic amenities
- Delicious Thai meals including fresh-caught fish from the lake.
- Canoes or kayaks included in your stay.
- Extremely limited internet if any
- Electricity is only available at certain times of the day.
- You are a long way from shops and medical assistance.
Packing List
- Rain gear
- Waterproof phone case
- There are few, if any, mosquitoes at the raft houses but we recommend insect repellant for hikes in the jungle.
- Power bank
- Sturdy shoes for trekking and flip flops for relaxing at the raft house.
- Dry clothes to change into after your excursions.
- Swimming gear and a towel
- Sun protection - hat and cream
- Some cash – there are no ATMs on the lake.
- A torch or headlamp
Advice for Families Visiting Cheow Lan Lake
Travelling to Cheow Lan Lake with kids is an unforgettable experience that blends adventure, nature, and relaxation in the heart of Khao Sok National Park. Families can enjoy safe, scenic boat rides, gentle kayaking, and swimming in the calm emerald waters — all surrounded by Thailand’s most stunning limestone cliffs and jungle landscapes.
Family-Friendly Accommodation
Most raft houses do not allow overnight stays for infants and toddlers. If you’re visiting with young children (under 10 years old), check before you go.
Families with babies or toddlers are advised to stay overnight on land in Khao Sok Village, then take a guided day trip to the lake.
Family Activities on Cheow Lan Lake
- Longtail boat tours to see towering limestone karsts and hidden coves.
- Kayaking and swimming near your raft house.
- Easy wildlife safaris to spot monkeys, hornbills, or even wild elephants.
- Short hikes to viewpoints and caves suitable for children.
- Morning mist safaris are magical and ideal for curious kids who love animals and nature.
What to Pack for Families
Pack essentials for comfort and safety:
- Child-sized life jackets (Resorts provide them, but sizes vary)
- Sunscreen, insect repellent, and light rain gear
- Snacks and refillable water bottles
- Waterproof phone case, dry bags, and extra clothes
Meals at floating bungalows are typically Thai style. However, you will find mild dishes suitable for most children.
Eco & Safety Tips
- Always supervise children near water and while boarding longtail boats.
- Avoid feeding animals or fish — it harms the ecosystem.
- Encourage kids to appreciate the sounds of the jungle quietly during safaris.
Cheow Lan Lake is one of Thailand’s most family-friendly natural destinations, combining fun, education, and tranquility. Whether you’re relaxing in a floating bungalow, spotting wildlife on an early-morning safari, or paddling across turquoise waters, it’s a nature escape your family will never forget.
Cheow Lan Lake FAQs
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Why is Cheow Lan Lake famous?
It’s famous for its floating bungalows, breathtaking karst scenery, and opportunities for wildlife spotting, kayaking, and jungle trekking. -
What can you do at Cheow Lan Lake?
Popular activities include boat tours, swimming, kayaking, cave exploration, hiking, birdwatching, and staying overnight in floating bungalows. -
How long should I stay at Cheow Lan Lake?
Most visitors stay 1–2 nights to fully experience the lake, though day trips are possible from Khao Sok or Surat Thani. -
Can you swim in Cheow Lan Lake?
Yes, swimming is allowed in designated safe areas near the floating bungalows or during guided boat tours. -
What wildlife can you see at Cheow Lan Lake?
Visitors may spot gibbons, hornbills, langurs, wild elephants, and a variety of tropical birds and reptiles.
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