Tham Lot

Tham Lot is a large karst cave system in Pang Mapha District, Mae Hong Son province in northern Thailand. It is notable for an underground river that runs through its main chamber and for ancient teakwood coffins found within.

The cave contains broad caverns with stalactites and stalagmites and an active stream that cuts through several chambers; guided bamboo-raft trips navigate the lower waterway and footpaths lead into the main galleries. Wildlife, archaeological deposits and large rock formations are visible in different sections of the cave.

Formed by karst processes, the cave has yielded archaeological materials including human remains and timber coffins attributed to local hill communities and prehistoric use. Local people, archaeologists and tourism operators have long recorded finds and organized visits to the site.

Situated in Pang Mapha District of Mae Hong Son province, Tham Lot lies in a karst landscape of northern Thailand; access is typically via the district town of Pang Mapha and local guides operate visits from the surrounding area.

• Teak coffins: The cave contains multiple ancient teakwood coffins and archaeological remains that have been documented by researchers and local historians.
• Bamboo-raft access: Lower passages are commonly traversed by bamboo raft under guide supervision where an underground stream flows through the main gallery.