Photo: Classic architecture, Khong Chiam.

Sam Phan Bok

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They call it the “Grand Canyon of Siam” and some have even compared it to the surface of the moon: a continuous current of rock notched with 3,000 holes, known in the Lao/Isaan language as Sam Phan Bok. Though difficult to reach in a distant corner of Ubon Ratchathani province, the other-worldly landscape and Mekong River scenery make it worth the effort.





Hole #1,937.

Hole #1,937.

The 3,000 impressions (certainly it’s an exact count!) look like they were carved out of the rock by a giant ice-cream scooper — a landscape that would make a fine filming location for a sci-fi flick set on the surface of another planet. Sam Phan Bok (it rhymes with “on Ron’s joke”) doesn’t look anything like the real Grand Canyon, but it certainly is one of a kind.

Approaching the boats.

The remote setting is part of the allure.

Much of the rock submerges during the rainy season in an ancient process that helps to polish and sculpt the cavities. Turning into miniature mirror-like ponds of rainwater in May and June, some of the holes are shaped like hearts or Mickey Mouse’s head. When dry, locals lay down mats to enjoy a meal in some of the larger and comfier depressions. Dry season also sees the Mekong narrow to a mere 56 metres across, supposedly its narrowest point south of China.

Water is quite the natural artist.

Water is quite the natural artist.

Legend has it that a greedy king once left a dog here to die after it loyally guarded a treasure discovered in one of the holes. Sure enough, one of the larger rock formations looks convincingly like the head of a dog, some sort of retriever, gazing at the river. Another formation has a protrusion resembling a flower vase; give it a good rub and winning lottery numbers might come dancing into your mind, or so they say.

See the pooch’s head on the right?

Perhaps Medusa was out for a cruise that day?

The rocks stretch between the river and a grassy embankment for some 10 kilometres; you could easily lose an entire day wandering the smooth slopes and drifts. At one point the rock gives way to a steep incline of powdery beige sand with tall grasses that suddenly reminded us of an ocean-side dune in North Carolina. In other places, the rocks shift from shades of grey to fiery orange and jet black.

Where did this beach come from?

Where did this beach come from?

From the comfort of a wooden longtail boat you can see the almost 90-degree rock walls that explain why they call Sam Phan Bok a canyon. The rocks tower far overhead when the water is low, but after a solid few months of rain they appear as nothing but another natural surface slapped by the Mekong’s bubbling brown water.

Hand-painted numbers tell you how high the water is.

Hand-painted numbers tell you how high the water is.

Long before it became a tourist attraction, Sam Phan Bok was known to be a particularly good place to fish due to the shifting currents and underwater holes that leave fish at the river’s mercy. You can still see plenty of locals seated along volcanic rocks on both the Lao and Thai sides, repeatedly dipping their broad bamboo nets into the river.

Sure beats a fishing pole.

Sure beats a fishing pole.

Sam Phan Bok is best visited around sunrise or sunset, when the air is cool and reflections of the sun shimmer amid the thousands of holes. During our late June visit, a rainshower rushed in from the west and unleashed a five-minute dowpour before carrying on into Laos. In its wake, a double rainbow materialised in the south as the sun emerged from dark clouds to dip into the river.

The Mekong never disappoints.

The Mekong never disappoints.

Depending on a given traveller’s style and budget, there are a few ways to approach Sam Phan Bok. The cheapest is to simply walk down to the rocks on your own and aimlessly wander around. Another option is to pay 50 baht per person for a songthaew to drive you down towards the boats, which cost 500 baht for a 30-minute trip or 1,000 baht for a full hour. The songthaew driver (or his young son or daughter) may also serve as a guide for no extra charge, though tips are appreciated. They speak little or no English, but at least they can lead you directly to some of the more interesting rock formations.

No explanation needed.

No explanation needed.

At time of writing there is no entry fee to visit Sam Phan Bok, though we won’t be surprised if the Thai government declares it a national park at some point. A couple of small restaurants are located near the entrance, and a few resorts are found along the access road.

Sam Phan Bok is a great way to cap off a day that could also include Pha Taem National Park and its cliffs and waterfalls, which are all located off Highway 2112 on the way north to Sam Phan Bok from Khong Chiam. The scenic ride takes you past forest and rice paddy on a sparsely trafficked two-lane highway.


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How to get there
Sam Phan Bok is located near the town of Song Khon, a 75 km drive north of Khong Chiam along Highway 2112. Ubon Ratchathani is 115 km to the southwest along highways 2050 and 2337, and Mukdahan is 130 km to the north along highways 2034 and 2242. The turnoff is sign-posted in English. You'll need your own wheels to get here; consider hiring a car or motorbike -- with or without driver -- in any of the three destinations mentioned above. December to June is the best time to visit.

Sam Phan Bok
Near the town of Song Khon
Admission: Free

Location map for Sam Phan Bok

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 Browse our independent reviews of places to stay in and around Khong Chiam.
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