Tham Hong is a medium-sized cave with a stream running through its centre before going subterranean to another stream outside. Stalactites and stalagmites of strange shapes abound in the cave. The most distinctive characteristic of the cave is a waterfall that drops down 3 levels. Visitors in the cave must wade through water before emerging from the exit 300 metres away. The cave is under the jurisdiction of the Khao Nanthi National Park Protection Unit (Khlong Lamphaen). The cave is situated just before Krung Ching waterfall.