Photo credits: https://goo.gl/images/jrNGnh
Puerto Princesa Underground is one of the most famous tourist spot in the Philippines. It is included in the New 7 Wonders of Nature in the world and the longest navigable underground river.
The cave span for a total 24km underneath the mountains, the river distance is about 8.2km way through. Besides of being one of yhe longest river, it is also belong to few rivers that outflows directly to the sea.
Inside the cave, there are lots of species you can see. Like bats, crabs, spiders and etc. Other than that you can also see the beautiful formation of rocks while passing through the cave.
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