Wat Tham Din Phiang

Wat Tham Din Phiang is a Buddhist cave temple in Pha Tang Subdistrict, Sangkhom District, Nong Khai Province, northeastern Thailand near the Mekong River. It is notable for its extensive underground cave system accessed through a narrow entrance, featuring stalactites, stalagmites and rock formations linked to Naga folklore. The temple above the cave serves as a meditation and pilgrimage site, attracting visitors interested in geology, local legends and Buddhist practice.

Visitors can expect a temple compound above ground with a shrine hall and Naga statues, and an underground cave accessed only with a local guide. The cave is narrow, low and winding, with electric lighting provided by guides. Inside are stalactites, stalagmites, rock formations interpreted as Naga-related features, and small Buddhist altars. The surrounding area is forested and quiet, with views toward the Mekong River valley. Exploration involves crawling and crouching in sections.

The cave temple is associated with local Buddhist folklore concerning Luang Pu Thep Lok Udon and the Naga, a serpent-like being in Mekong River beliefs. The cave has long been used as a meditation site for monks and is regarded as a sacred underground pilgrimage place in Sangkhom District.

The temple is a Buddhist religious site and pilgrimage destination reflecting Isan reverence for Naga folklore along the Mekong River. Visitors observe Buddhist merit-making practices, Naga veneration, and meditation traditions linked to the cave's spiritual significance.