
Blue Hole, Belize (Image Credit)
Divers will enjoy the Blue Hole in Belize. Formed by an underwater sinkhole, the depths reach down to four hundred feet. It is the largest natural underwater sinkhole and is protected by the Barrier Reef Reserve System.
Much like the underwater in Belize, rather than existing underground, the lakes found off the Gulf of Mexico exist, you guessed it, underwater. How is that possible? Well, the lakes are made up of brine water which has a very high salt to water ratio. Much more salt than is found in regular ocean salt water. The extra salt content means the brine water is significantly heavier than the ocean water surrounding it, so it gathers on the ocean floor, creating lake formations that even have their own shores.
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