Tham Lot cave is a cave system with a length of 1,666 meters near Sop Pong in Pang Mapha District, Mae Hong Son Province, northern Thailand. The Nam Lang River flows through the cave which is filled with stalactites, stalagmites, columns, and flowstone. The cave is a karst cave set in Permian age limestone. The cave has a large population of bats and …Tham Lot cave is a cave system with a length of 1,666 meters near Sop Pong in Pang Mapha District, Mae Hong Son Province, northern Thailand. The Nam Lang River flows through the cave which is filled with stalactites, stalagmites, columns, and flowstone. The cave is a karst cave set in Permian age limestone. The cave has a large population of bats and Himalayan swiftlets. In Tham Lot and other caves nearby teakwood coffins have been discovered which are thought to have been carved by the Lawa tribes people thousands of years ago.