Brazil: Crystalline Underground Waters
Mato Grosso do sul region in Brazil (and especially the quiet town of Bonito) Boasts
many marvelous underground lakes: Gruta do Lago Azul, Gruta do Mimoso, Aquario
Natural. Intricate limestone formations and grottos hide the intensely- colored pools
and waterfalls (many adventure tours there diving, some pools are more than 100 meters deep)
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(images via)
Limestone caves in the same region offer fantastic exploration:
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(images via)
Venezuela: Cave of the Ghost
Cueva del Fantasma is big enough for two helicopters to fly into it, not
technically a cave – rather, a collapsed gorge. It does, however, sport a huge waterfall right inside of it:
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