Kong Lor Cave, known locally as Tham Kong Lo, is a stunning natural wonder located in Phu Hin Bun National Park in the Khammouane Province of central Laos. This colossal cave stretches over a length of 7.5 kilometers and offers an awe-inspiring subterranean landscape with its gigantic chambers, mighty stalactites and stalagmites, and a navigable river running through it. The cave is formed by the Hinboun River, which flows through the cave year-round, creating an otherworldly experience for those venturing into its depths by boat. The cavern’s ceiling, in places up to 100 meters high, coupled with its width that sometimes exceeds 90 meters, is a testimony to its grand scale. Historically, Kong Lor Cave has been a significant aspect of local folklore and remains an essential spiritual site for the surrounding communities. Tourists can explore the cave's vast network and be mesmerized by the dramatic limestone formations and ethereal lighting provided by occasional sinkholes. Beyond its natural beauty, it is a site of adventure for kayaking, caving, and trekking enthusiasts.