Tham kong lo, also known as Kong Lo cave, is a limestone cave in Phu Hin Bun National Park. Located on the Phu hin bun river, the cave has been described as a geological wonder of southeast asia. The kerst cave is more than6,5 km (4miles) long and up to 91 meters (300 feet) high. It containd anemerald-colored pool that locals believe is is sacred, saying it reflects the skin color of lndra,a hindi god. Previous cave visitors praise a boat ride through the cave, calling it a grand adventure. Staying in a private home is easy to arrange for those in need of overnight accommodations.