Characterized by a funnel shape, it has a diameter of 500 metres and it is 200 metres deep, with an overall surface area of 18 hectares. Everything in Su Suercone, which is also called Su Sercone or Sellone, is 'oversized': it is the largest sinkhole in Sardinia, the result of the dropping of a karst vault in the heart of the limestone plateau of the Supramonte di Orgosolo.​ It can be reached via different and long itineraries that require physical effort, adequate equipment and the support of expert guides. Crossing through the wild, unspoilt nature, between sheer rock faces, thalwegs, gorges and gullies, this is a true paradise for expert climbing enthusiasts.

It seems inaccessible, but this is only because the sheer rock face, which is practically vertical, might discourage you. There is, however, a passageway between the rocks: it runs alongside the wall in a southern direction and opens the door to an authentic and majestic natural wonder. There are several drinking troughs in the area, dug out of tree trunks, demonstrating the ancient pastoral activities that took place inside the sinkhole. In the northern part, a vertical 30-metre ponor is visible, probably communicating with the underlying karst system.

Lush nature grows inside it. Mainly on the rock faces: there are centuries-old trees about twenty metres tall and with diameters of up to one metre, while on the damp terraces, mosses and spectacular ferns are widespread.

Humans have been present in this part of the Supramonte area since prehistoric times, as is documented by numerous artefacts used for funerals and found in the clefts. The archaeological area of Campu Donianicoro is located at approximately 900 metres of altitude.