The Angelita is a surprising little swimming hole located in Mexico's Yucatan Peninsula. From the surface it appears perfectly normal but after diving about 100 feet, you will find a little river flowing below. This is do to the fact that Angelita is a cenote or a sinkhole that has exposed groundwater underneath. Like most cenotes, they are connected to a subterranean bodies of water with underwater cave systems. The little river flowing below is truly just an illusion due to halocline, different layers of salinity within the hole. The first layer is fresh water, the next hydrogen sulfide and the last layer is salt water. The 'river' is truly is dense salt water at the bottom of the cave that appears as a different shade.
from the top
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