Next time you're in Mexico, skip the tequila and visit Cenote Angelita (Little Angel) on Mexico's Yucatan Peninsula. Scuba dive along one of the most amazing natural formations, an underwater river!
The natural formation occurs when hydrogen sulfate mixes with saltwater causing it to be much heavier than regular salt water. The mixture sinks to the bottom, forming a distinct separation that flows like a river.
The deep sea river is complete with sandy and rocky shores, leaves, and fallen trees.
Check out Anatoly Beloshcin's website for more spectacular underwater photography.