Subterranean river that flows to the ocean
The National Park Puerto Princesa Underground River, a World Heritage Site by UNESCO, and one of the new natural wonders of Humanity is a unique underground river that flows into the ocean, and although UNESCO named it a World Heritage Site in the year 1999, is now in its most popular time because it has been named named a New Natural Wonder of the World, which triggered the tourism and makes getting a seat without a booking is a thing of luck. The maximum number of visitors per day is 900, and if you get there without a reservation you are put on a waiting list, and the next day at 8 am you go there to see if you are lucky.The days I was there everyone could get in, I'm not sure that they respect the maximum number because from 8am boats are coming with 8 passengers towards the river every few minutes.