Parco naturale delle Grotte di Oliero, Nature reserve and cave system in Valbrenta, Italy.
The Oliero Caves Nature Reserve contains underground chambers and passages carved by water flowing through limestone rock over millions of years. This network of passages includes an underground river that continues beneath the surrounding terrain.
The cave system was first documented in 1804, sparking scientific investigations that revealed key geological formations in northern Italy. These studies exposed the complex network of underground water systems beneath the region.
The park houses a geological museum with mineral samples and fossils that explain how the caves formed and showcase the local natural environment. Visitors gain insight into the processes that shaped these underground structures over time.
Visitors explore the caves on guided boat tours while wearing provided safety equipment throughout the journey. Regular tour departures throughout operating hours make it easy to visit at your own pace.
The cave system holds Europe's deepest siphon, descending 135 meters and connecting to an extensive underground river network beneath the Asiago plateau. This geological feature draws specialized researchers and diving expeditions to study its depths.
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