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 karst cave is more than 6,5 km (4 miles) long and up to 91 meters (300 feet) high. It contains an emerald-colored pool that locals believe is sacred, saying it reflects the skin color of Indra, 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.