
Sam Phan Bok, also known as the Grand Canyon of Thailand, is a seasonal attraction and the biggest rock reef in the Mekong River. It is located in northeastern Thailand, about 700 km from Bangkok, and is best visited during the dry season from December to May. The area features thousands of oddly-shaped holes and rock formations, with some resembling the Mickey Mouse logo and a dog's head. To get to Sam Phan Bok, you can take a bus to Posai in the morning, hire a taxi or car with a driver, or join a boat tour from Had Salueng. It is recommended to visit early in the morning or evening to avoid the heat and crowds, and to wear proper shoes and bring water.
| Characteristics | Values |
|---|---|
| Location | Baan Phong Pao, Lao Ngam Sub-district, Pho Sai District, Ubon Ratchathani Province, Thailand |
| Distance from Bangkok | 700 km |
| Translation | 3,000 shallow lakes |
| Alternative Names | Grand Canyon of Siam, Grand Canyon of Thailand, Sam Phan Bok |
| Best Time to Visit | Morning, Evening, Dry Season (December to May/June) |
| Transport | Car, Boat, Bus, Taxi |
| Tour Options | Songthaew, Boat, Long-tail boat |
| Tour Costs | 200 THB per car, 500 THB per boat, 20 THB for parking |
| Accommodation | Plaifah Resort, Had Salueng |
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What You'll Learn

Go by boat
Sam Phan Bok, also known as the "Grand Canyon of Thailand", is a seasonal attraction located 700 km from Bangkok. The area is known for its sandstone rock formations and erosion, with thousands of holes scattered along the Mekong River. The best time to visit is during the dry season, from November to June, as the sandstone is underwater during the rainy season.
If you want to go by boat, there are a few options. The closest airport to Sam Phan Bok is Ubon Ratchatani, which is a 1.5-hour drive to the east. From there, you can hire a long-tail boat from Pho Sai to reach Sam Phan Bok. It is recommended to hire a boat with a local guide, who can take you to the best spots for photography and unique rock formations. These tours can be found at the edge of the water, and the cost varies depending on the duration of the ride.
Another option is to drive from Ubon Ratchatani towards Pho Sai, which takes about 2 hours. From Pho Sai, you can either continue by car or hire a long-tail boat. If you choose to drive, it is recommended to hire a car with a driver, as it is a long journey.
The best time to visit Sam Phan Bok is either early in the morning or in the evening, as the temperatures are lower and the light is better for photography. Keep in mind that within an hour of sunrise, the rocks can get very hot, so bringing an umbrella for shade is recommended.
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Go by bus
Sam Pan Bok, located in the Pho Sai District near Ubon Ratchathani, is often referred to as the Grand Canyon of Siam. It is famous for its sandstone cliffs and thousands of holes carved out of rocks by the swirling waters of the Mekong River.
To get to Sam Pan Bok by bus, you can follow these steps:
Bus from Ubon Ratchathani
- Take a bus from Ubon Ratchathani to Pho Sai. The bus ride is approximately 20 km from Sam Pan Bok.
- From the city centre of Ubon Ratchathani, you can take Highway 2050 towards Pho Sai District. This route will lead you to the parking area at the shoreline of the river.
- Alternatively, you can take a bus from Motchit 2 Station in Ubon Ratchathani to Pho Sai. This is a more cost-friendly option for local commuting experience.
- There is also an Air Ubon Express bus service available, which is the fastest option, taking around 9 hours to reach your destination.
Bus from Bangkok
- If you are coming from Bangkok, you can take a bus to Ubon Ratchathani. The Bangkok-Ubon Ratchatani route is available daily for guests.
- You can board the train from Hua Lamphong station or Bang Sue station in Bangkok.
Bus from Khongjiam
- Another option is to take a bus or drive from Khongjiam (Khong Chiam) to Sam Pan Bok.
- Khongjiam is approximately 75 minutes away from Sam Phan Bok.
It is recommended to visit Sam Pan Bok during the dry season, from December to May, as the area is only accessible during this time. The site tends to get crowded on weekends, so it is advisable to visit on weekdays to avoid the rush. Additionally, early mornings or late afternoons are ideal as it can get extremely hot during the day, and there is limited shade available at the site.
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Go by car
Sam Pan Bok, also known as the "Grand Canyon of Thailand", is located in Ubon Ratchathani, Thailand. It is about 700 km from Bangkok and is a 1.5-hour drive from the Ubon Ratchatani airport.
If you want to stay in a nice resort, you can drive to Khongjiam (Khong Chiam), which is about 1 hour and 15 minutes from the airport. From there, it is another 75-minute drive to Sam Pan Bok. The best way is to hire a car with a driver. There is also the option of driving from Ubon toward Pho Sai, which takes about 2 hours.
All the sights along the river, including Sam Pan Bok, Had Chom Dao, and the narrowest part of the Mekong River, are accessible by car. There is parking available for cars at all of these locations.
It is recommended to visit Sam Pan Bok in the morning or at the beginning/end of the day when it is cooler, as it can get very hot out on the rocks. The best time to visit is from December to May, during the dry season.
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Best times to visit
Sam Phan Bok, also known as the Grand Canyon of Thailand, is a seasonal attraction. The best time to visit is during the dry season, from December to May, when the river is not overflowing with water. During the rainy season, the Mekong River floods the canyon, rendering the holes inaccessible. Therefore, it is recommended to visit during the dry season when the eroded rock landscape can be fully appreciated.
The area is particularly busy during weekends and public holidays, so it is advisable to visit on weekdays to avoid the crowds. It is also recommended to visit early in the morning or in the evening to avoid the hottest part of the day and to take advantage of the best lighting conditions for photography. The golden hours around sunrise and sunset are especially popular for the low temperatures and the way the golden sunlight shimmers against the layered stone surfaces.
If you are looking for a quieter experience, consider visiting later in the day. One visitor reports that they had the place almost to themselves in the late afternoon, and the reflection of the setting sun on the water in the "3000 holes" was a highlight of their trip. However, another visitor who arrived at 6 pm noted that they felt it was too late as they were losing sunlight.
To reach Sam Phan Bok, you can take a bus from Bangkok, which departs once a day in the morning, or hire a car with a driver. The journey from Ubon Ratchatani airport takes approximately 1 hour and 30 minutes by car.
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Similar destinations
Sam Pan Bok, also known as the "'Grand Canyon of Thailand', is a spectacular sight. The sandstone formations along the Mekong River have been eroded by swirling waters during the rainy season, forming more than 3,000 holes or "bok", which are exposed when the river level falls.
If you're looking for similar destinations, there are a few options nearby:
Had Chom Dao
Roughly translated as "star-gazing beach", Had Chom Dao (หาดชมดาว) is similar to Sam Pan Bok, featuring impressive sandstone formations. However, it boasts deeper canyons and different rock formations. Had Chom Dao is accessible by car, and it is recommended to visit early in the morning or in the evening to avoid the hottest part of the day and get the best light for photographs.
Had Salueng
Most of the accommodation near Sam Pan Bok is at Had Salueng (หาดสลึง), which is accessible by car. From here, you can take a boat trip along the Mekong River to Sam Pan Bok, which costs around 500 baht per half-hour.
Pak Bong
You can also take a boat trip from Had Salueng that includes Pak Bong, the narrowest point of the Mekong River. Here, you can see local fishermen using large bamboo and netting scoops to catch fish.
The Emerald Pool
A large pool with clear emerald green water, located near Sam Phan Bok.
Phupan Mountain
A mountain located near Sam Phan Bok.
Khae Song Khon
A waterfall near Sam Phan Bok that is open year-round, except during the rainy season when it is closed due to the danger of flooding.
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Frequently asked questions
The best time to visit Sam Pan Bok is during the dry season from December to May. During the rainy season, the canyon is flooded and the holes are inaccessible.
Sam Pan Bok is located 700km from Bangkok, in the Isan region of Thailand. You can take a bus to Posai in the morning, but there is no bus to return on the same day. You can also hire a taxi from the bus station, or drive from Ubon Ratchatani airport.
Sam Pan Bok, also known as the "Grand Canyon of Thailand", is a large, crater-filled rock reef with thousands of oddly-shaped holes. You can take a boat ride to see the holes, or walk along the riverbank. There are also interesting rock formations to see, such as the famous Mickey Mouse-shaped hole.
It can get very hot at Sam Pan Bok, so it is recommended to visit early in the morning or in the evening. Wear proper shoes as the rocks can be slippery, and bring a hat or umbrella for shade.
The best time for photography is during the golden hours at sunrise and sunset. The low temperatures and golden sunlight create a beautiful effect on the layered stone surfaces.











































