Phra That Phu Pek, Phu Phan National Park

Phra That Phu Pek is an ancient temple in Sakon Nakhon Province, in the Isan region of Thailand. This ancient Khmer ruin was built from sandstone, standing on a laterite base. This is a Buddhist temple ruin of Khmer origin in the form of a chedi, it was built in the 16th-17th Buddhist century. The ruin is special as it houses a solar calendar, a cube-shaped rock, in its stupa. The ancients used it for indicating the position of the sun, important for religious rites and agricultural seasons. ()