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Mina da Passagem Mariana RS0082.jpg
Mina da Passagem ( Passagem Mine ) is the largest still existing mine to visit in the world with 30 km of tunnels with underground lakes of crystal clear water - nowadays it is used for tourism, it is one of the best meeting points of cave divers in Brazil and it is also a large field for researchers who come from around the world.  Mariana District, Minas Gerais State, southeast Brazil.