Su Gologone, Natural spring in Oliena, Italy
Su Gologone is a karst spring northeast of Oliena, on the northern slope of the Supramonte massif, where water rises from a crack in the limestone at the bottom of a bluish pool. The explored cave system behind the crack reaches 135 metres deep. A short stream flows from the pool and joins the Cedrino River after a few metres.
The spring served as a vital water source for communities in the mountainous Supramonte region since ancient times. It played a central role in supplying settlements across this remote part of the island.
The spring sits in the Supramonte of Oliena, a territory whose name and everyday identity are tied to the karst water that feeds the Cedrino. The pool is a landmark of the municipality, and the surrounding limestone slopes are used for walking and for reaching the three caves beside the source. The water emerges from a submerged fissure in the rock, not from an open cave mouth.
The site has parking and an entrance area with facilities for visitors. Swimming and littering are not permitted, so visitors should follow these rules when visiting.
The explored shaft of the cave system behind the spring reaches 135 metres, but the conduit continues beyond that point. Three grottoes stand right beside the spring. Flow figures in the sources vary widely: an average of 500 litres per second in one, 60 in another, with flood peaks estimated at 8,000 or even over 50,000 litres per second.
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