Moinhos Velhos Cave
Mira de Aire, Portugal
Adventure
The Moinhos Velhos Cave, is one of the most important cave systems known in the Portuguese Estremadura Limestone Massif, with about 9 km in extension. It is characterized by the existence of two fóssil paragenetic main conduits of about one decametre in diameter with dendritic tributaries, and a set of semi-active passages in a dendritic pattern at the north and angulate at the south.
From Wikipedia, CC BY-SA 4.0
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