John Brooks said:
>Here is one that you missed David. It has a wikipedia page also.
I checked Wikipedia for Puerto Princesa Subterranean River National Park
and in the description it says:
>Until the 2007 discovery of an underground river in Mexico's Yucatan Peninsula
>[1], Puerto Princesa's underground river is reputed to be the world's longest.
I wondered what underground river they could be thinking of in Mexico,
but it turned out they were referring to Sac Actun, which is essentially a
completely submerged dive trip. Not exactly the same thing as a large
air-filled river cave.
Mark Minton
