Tham Kong Lo or Kong Lor Cave[1] is a karst limestone cave in Phu Hin Bun National Park, in Khammouane Province, Laos.[2] It is located roughly 130 kilometres (81 mi) north of Thakhek, on the Nam Hin Bun River, which flows into the cave. The karst formation is dramatic and the cave has been cited as a "one of Southeast Asia's geological wonders".[3]