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Why Top:
It’s one of Sardinia’s most stunning natural wonders, offering a rare glimpse into ancient geology and a serene, otherworldly atmosphere.
Description:
Formed in limestone, this karst system comprises three branches, of which the southern one is outfitted for visitors with about 900 meters of illuminated galleries. Inside are stunning stalactites, stalagmites, several freshwater lakes, and Neolithic petroglyphs of the Ozieri culture. Annual guided tours on metal walkways allow safe exploration of water-filled chambers and sandy “beaches” of subterranean rivers. Limited access and no land route preserve its secluded, pristine atmosphere.
Facts:
First scientific exploration took place in 1952.
The southern branch has been open to tourists since the mid-1950s.
Over 70 km of passages have been surveyed, with 900 m accessible to visitors.
Petroglyphs (4000–3500 BC) and freshwater lakes were discovered here.
Named after the monk seal that inhabited it until the 1970s.
Significance:
Regional; part of the Codula di Luna karst system and protected within the Gulf of Orosei and Gennargentu Park.
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Do:
guided boat tours
spelunking
petroglyph observation
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112
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Safety:
No lifeguards. Strong currents and steep shore. Slippery areas in caves. Unstable signal coverage. Crime rate is extremely low, with virtually no reports of theft or violence. There is no known threat of terrorism.
Clothing:
Light clothing, a jacket or sweater for inside the cave, non-slip footwear.
Climate:
Mediterranean: hot dry summers, mild winters; cave temperature stable at 18 °C.
Tips:
Book tours in advance, bring water, avoid flash photography, follow the guide’s instructions, and stay with the group.
Connection:
No Wi-Fi. Mobile coverage is unstable — signal drops en route and is completely unavailable inside the cave. A satellite phone ensures reliable communication in emergencies.
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