Puerto Princesa Subterranean River National Park
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Puerto Princesa Subterranean River National Park[8] - more commonly known as the Underground River. At over 8 kilometers in length, is reputably the longest underground river in the world. With its crystalline waters and spectacular cave formations, the Underground River is possibly Puerto Princesa's most popular attraction. The site was also declared a UNESCO World Heritage site in 1999. The winding path of the river is navigable via small pumpboats that depart from Sabang Beach. Travel time from the city proper to Sabang is about 1.5 hours (This can take closer to 3.5 if you choose to ride in a Jeepney, since you have to wait while they deliver goods along the journey).
