"Puerto Princesa's Underground River is a protected natural area in the Philippines. Tourists can take a boat ride into this UNESCO Heritage Site anytime during the year. The walls of the 80-meter long underground river are made out of limestone, while the water emerges directly into the sea. It is around an hour and a half from the Puerto Princesa International Aiport."
Had a great time! The resort had a nice location in such a way that it's easy to book and enjoy adventure-related activities. The staff were very nice. We love the pool bar. Will definitely go back!