Our opinion Part of the natural park of Sabang, the Underground River is registered at UNESCO world heritage
The Sabang Underground river is the longest navigable underground river in the world. That says it all, a not-to-be-missed!
More on Underground River Tripdavisor page.
Our advice: Being a very popular site, it can be crowded in the morning, thus we advise our guests to go for the afternoon tour (before 3pm).