Sam Trai Waterfall is located in the Phanom Dong Rak Wildlife Sanctuary in Sisaket Province, Thailand, along the mountain range that stretches along the Thailand–Cambodia border. This area is highly significant as a watershed forest that remains rich in natural resources and serves as the origin of several streams, including the Sam Trai stream, which directly forms the waterfall. The waterfall is created by natural water flow cascading through highland rock formations.Geologically, Sam Trai Waterfall is formed from sandstone and sedimentary rock layers that have accumulated over millions of years. This creates a stepped rock surface, causing the water to flow gradually over multiple levels rather than dropping from a steep cliff like a typical large waterfall. As a result, it forms a wide and gently sloping waterfall terrace, giving the flowing water a smooth and layered appearance.

The surrounding area is a mixed dry evergreen and deciduous forest, which is highly rich in biodiversity. It consists of large hardwood trees such as teak, dipterocarp, and other native species, along with ground vegetation like ferns, moss, and lichens growing on rocks. The humidity from the waterfall spray creates a unique microclimate, making the area cooler and more humid than the surrounding forest.Wildlife in the area includes various bird species, squirrels, and other small forest animals, all of which contribute to a balanced ecosystem. Although larger wildlife is rarely seen, the area remains ecologically important as a wildlife corridor within the Phanom Dong Rak mountain range.

Sam Trai Waterfall is a seasonal waterfall, with water volume varying throughout the year. During the rainy season (May to October), the water flow is strong and covers the rock surface, making it the most visually impressive period. From late rainy season to early winter (September to November), the water remains clear and abundant, making it ideal for visiting. In the dry season, the water level decreases significantly, sometimes leaving only a small stream.The waterfall features a long, sloping rock terrace rather than a steep vertical drop, allowing visitors to walk along different viewing points beside the stream. In some areas, visitors can rest on rocks, although caution is needed as the surface may be slippery due to moss and moisture.

Because the area is a protected wildlife sanctuary, tourism is strictly regulated by park authorities to preserve the ecosystem and minimize human impact. Visitors are required to follow regulations carefully.Overall, Sam Trai Waterfall is a natural tourist destination suitable for those seeking peace, greenery, and an authentic nature experience. It is also ideal for light trekking, relaxation, and ecological learning in one of the more well-preserved forest areas of southern Isan.

Adission Fee:

• Thai visitors: Adults 20 THB / Children 10 THB

• Foreign visitors: Adults 200 THB / Children 100 THB

• Vehicle fee: approximately 30 THB per car

• (Fees may change according to Department of National Parks announcements)

Opening Hours:

• Open daily from 08:30 AM – 04:30 PM