The entrance to the underground river in Puerto Princess, Palawan, Philippines. This is the longest navigable underground river in the world. You can take it about 6km into the mountain by boat.

Entrance to the underground river in Palawan, Philippines
- 4 Comments... What's your take?
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awesome. . i wanna go there someday. .
This is a nice picture, a nice place to commune with nature too.
That's beautiful. How was the trip into the mountain?
Absolutely enchanting. I think that the Philippines may be the next place to go. It has often kept a low profile but seems to offer quite a lot.