'Anahulu Cave, located on Tongatapu Island in Tonga, is a stunning limestone cave and the only freshwater cave on the island. Spanning 400 m (1,300 ft) in length, the cave is illuminated by artificial lighting, revealing its majestic stalactites and pillars. Visitors can traverse the well-formed walkway and follow guide ropes to a serene freshwater pool, ideal for a refreshing swim. A small entrance fee grants access to this natural wonder, allowing you to immerse yourself in a unique subterranean experience.