It lies northeast of the Gennargentu massif, traveling eastwards until it reaches the Tyrrhenian Sea at the Gulf of Orosei.

It has an area of about 35,000 hectares, encompassing most of the territories of the comuni (municipalities) of Baunei, Dorgali, Oliena, Orgosolo and Urzulei.

Its highest peak is Monte Corrasi (1,463 m), and the average altitude of the chain is about 900 m. The Supramonte is characterized by Karstic highlands in which rivers have created deep ravines and canyons.

In prehistoric times, the Supramonte area was more densely populated than it is today, as attested by traces of at least 76 villages, 46 nuraghes, 14 dolmens, 40 Giants' graves, 17 holy wells and 3 megalithic walls.

Notable archeological sites include the village of Serra Orrios (located slightly north of the northern edge of the limestone lands), which contained about 70 circular huts and two megaron-like temples, and the nuraghe village of Tiscali, located in a strategically high position between the valleys of Lanaittu and Oddoene.