It is situated at Ban Tamnaksai, Tambon Bak Dong, along the edge of highway 2127 (Khun Han-Ban Samrongkiat), 20 km away from Khun Han and 81 km away from the town.

Tamnaksai Khmer Ruins. Located at Ban Tamnaksai, Tambon Bakdong, Tamnaksai Khmer Ruins has a single stupa on sandstone base. The brick stupa has rectangular shape and one real door at the east while the other three are fault doors with carved door frame on the brick. Two carved guardian lions are watching the gate. The front door has frame made of sandstone.