Longest underground river discovered

Explorers in the Yucatán Peninsula have found what they believe may be the longest known underground river in the world. The system meanders through 95 miles of limestone caverns and has taken almost 4 years to map out.

The water inside the system stays a constant 76 degrees Fahrenheit year-round and is also stratified. A thin lens of freshwater floats on top of salt water. British research and diver Stephen Bogaerts said that much of the water is not necessarily flowing through the system either, rather up to 98% of the water is locked within the limestone.

Via UC Davis Geo News and National Geographic.

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