Is a huge cave system once a dwelling place of pre-historic man. Archaeologists have discovered ancient clay pottery and a number of carved wooden coffins inside the rooms of the cave. Tham Lot is located some 77 kilometres from town. Between Km.138 and Km.139 of Route 1095, a small roads lead to the cave after a 9-kilometre drive. Here nature has created an exotic subterranean wonder of darkness and mystery.

A brook runs from the cave mouth through to the other side of the mountain. It is a route where visitors may travel by raft or by foot to explore the 1-kilometre-long cave full of stalactites and stalagmites. There are services provided by villagers to guide visitors in their exploration at 100 baht per group. Accommodation as well as camping site is available near the Tham Lot Nature Study Centre in front of the cave mouth.