Grotta di Su Mannau, Natural cave system in Fluminimaggiore, Sardinia, Italy.
The cave extends for eight kilometers underground, featuring crystalline lakes, waterfalls, and numerous geological formations shaped by water erosion over time.
The cave system formed 540 million years ago through karst processes, with archaeological evidence showing its use as an underground temple in pre-Nuragic times.
Archaeological discoveries within the cave, including terracotta oil lamps, indicate the presence of ancient water worship rituals by early Sardinian inhabitants.
Visitors can take guided one-hour tours covering 500 meters of the left branch, walking on elevated pathways above underground water features.
The cave waters contain Stenasellus nuragicus, a specific type of shrimp found only in this location.
GPS coordinates: 39.40750,8.49347
Latest update: March 3, 2025 02:58
The Italian cave systems feature geological formations and underground landscapes. The grottos display stalactites, stalagmites, and prehistoric rock paintings. Many caves are accessible through footpaths or boat tours. The karst caves present natural tunnels, vaults, and subterranean rivers. Several grottos are located on the coast with sea access.
These locations across Sardinia include ancient ruins, natural springs, underground tombs, caves with stalactites, wall murals, prehistoric cult sites, lighthouses, beaches, and geological formations. The sites present regional history from prehistoric to modern times.
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