Myst'ry River, Indiana.
This river, in addition to Bluesprings cavern is a great place to tour if you want to visit underground world of caves.
Xcaret river is found in Mexico. It flows approximately 16.3 feet below the ground.
Puerto Princesa River.
Found in Philippines, it's one of the longest river to navigate or tour as it takes an 8 hour guided trip. It's a 8.3 kilometre long river but only 4.2 kilometres long is allowed for navigation by tourist.
Visiting Rio secreto has to be organized first, or booked prior to going. Activities to do in this river are swimming and hiking.
It is located in France.
It is the third largest underground river and is found in Puerto Rico.
Tham Koun Xe River.
It flows through many caves and has a small lake.
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