Its not really a river, its just hydrogen sulfide. It is neat to think its a river, since it, uh really looks like a river.
This awesome looking dive site is in a cave, that turns from fresh water to salt water.
If you want to visit the underwater river, you will need to learn to scuba dive and fly to Playa del Carmen, Mexico.
Well, this is one river you cant go floating down on a nice summer day. Go here to find more info about going diving there. They do whole package deals to see the caves.