Hranice Abyss: The deepest freshwater cave on Earth and a conduit to a 'fossil' sinkhole - Livescience.com

Name: Hranice Abyss
Location: Hranice, Czech Republic
Coordinates:49.53214473576795, 17.750610529720298
Why it's incredible: The cave is so deep, the world's tallest building could fit inside it.
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