Sam Phan Bok, meaning "Three Thousand Holes," is a remarkable natural site along the Mekong River in Pho Sai District, Ubon Ratchathani. Known as the "Grand Canyon of Thailand," it features more than 3,000 rock pools formed by river erosion during the annual flood season. These pools vary in shape and size, some as deep as three meters, creating a unique geological landscape rarely seen elsewhere.

The rock formations stretch over 10 kilometers along the riverbank. When water levels drop, the holes become visible, some filled with crystal-clear water reflecting the sky. Popular formations include the heart-shaped hole, dolphin-shaped hole, and star-shaped hole, which attract photographers and tourists alike.

Visitors can also explore nearby Hat Chom Dao, a scenic spot famous for sunrise views. Boat tours along the Mekong offer close-up views of the intriguing rock formations and river scenery. During the dry season, Sam Phan Bok serves as an open-air geological classroom, perfect for nature lovers and photographers, especially during the golden hours of morning and evening.

Local vendors offer traditional handicrafts and food nearby, while boat operators provide guided tours and share stories about the area's cultural heritage. Although somewhat remote, the area is accessible by car and public transport from Ubon Ratchathani city, with several rest stops and viewpoints along the way.

• About a 1.5 to 2-hour drive by private car from Ubon Ratchathani city

• Public transport options include local shared taxis or songthaews (pickup trucks with benches) from the city center

• Planning ahead is advised due to limited services in the area

• Wear sturdy shoes suitable for walking on uneven and slippery rocks

• Bring water and snacks, as amenities are limited

• Rent boats only from experienced and licensed operators for safety

• Early morning and late afternoon provide the best light for photography and sightseeing

• Exercise caution around deep pools and steep rock formations

Admission Fee: Free of charge

Opening Time: Open daily from 06:00 to 18:00