Underground rivers and caves in the park were registered as a World Heritage Site in 1999. Selected as one of the New 7 Wonders of Nature by the New World Seven Wonders Foundation. The river, which was created by the influence of the tide, has a total length of 8.2 km, a ceiling height of 6.5 m, the water depth changes depending on the tide, reaching a maximum of 14 m. Enjoy jungle trekking exploration in habitats of bats, large lizards, and rare butterflies.