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A karst complex that has been "alive" for 540 million years, where archaeology meets speleology.
In the Fluminimaggiore area, just a stone's throw from the Iglesiente mines and the wild Costa Verde, lies a hidden underground world of rare beauty. The Su Mannau Caves are a masterpiece shaped by water over half a billion years, a system that continues to evolve and stretches eight kilometres into the heart of the earth.
The tourist route meanders along suspended walkways stretching for approximately 500 metres, offering an accessible and evocative experience lasting about an hour. Move through shades of red rock, pure white stalactites and clear blue lakes supplied by the underground rivers Placido and Rapido.
Why visit: It's not just a cave, it's an underground temple. The Archaeological Chamber bears witness to an ancient water cult practised since pre-Nuragic times: numerous oil lamps have been found here, evidence of ancestral rituals. The cave is historically linked to the nearby Temple of Antas by a path already mapped out by the Romans.
Interesting facts and tips: Keep your eyes peeled as you explore the small lakes: you may spot Stenasellus nuragicus, a tiny transparent shrimp, a one-of-a-kind species. The route passes spectacular sites such as the Rodriguez Well, which is 23 metres deep and dominated by a 7-metre stalagmite column.
In the surrounding area: For lovers of more adventurous caving, the right branch (not open to tourists) hides wonders such as the Salone del Ribaldone (150 metres high) and the Salone degli Abeti, adorned with crystals that resemble trees. On the outside, the Iglesiente landscape offers a perfect blend of industrial archaeology and unspoilt nature.
