Su Suercone, Natural sinkhole in Supramonte di Orgosolo, Sardinia, Italy.
Su Suercone is a massive funnel-shaped sinkhole in the limestone Supramonte plateau, about 500 meters wide and descending 200 meters into the earth. The walls show clear rock layering and different vegetation zones from rim to floor.
This sinkhole developed gradually through the collapse of karst vaults in the limestone plateau and became the largest geological depression in Sardinia. The process reflects millions of years of water and rock erosion.
Herders have relied on this site as a water source for centuries, and old wooden drinking troughs remain visible inside. They show how important the place has been for the region's traditional livestock farming.
Access is not straightforward and requires good physical condition and local guidance to find safe routes down the southern wall. It is important to go with someone who knows the area.
The northern section features a 30-meter vertical opening that researchers connect to vast underground karst networks. This hidden connection shows how complex the underground system truly is.
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