The Supramonte is a mountainous complex characterised by carbonatic highlands and dolines. With an area of around 35,000 hectares, it also takes in the long stretch of coastline of the Golfo di Orosei and it falls within the territorial areas of the municipalities of Oliena, Orgosolo, Urzulei, Dorgali and Baunei. Enormous rocky bastions characterise the landscape, alternating with deep canyons and rocky peaks that tower into the sky. The Supramonte, for ease, is divided according to the territories of the municipal areas in which it falls. The Supramonte of Baunei is situated in the eastern extremity of the highground, in the highest part of the Ogliastra, and is home to the famous calcareous pinnacle called Agugliastra or Perda Longa, the Punta Ginnircu and the Pranu Supramonte. Also very characteristic in the territory of Baunei is the cave of Su Sterru, which is 275 m deep. A jump into the deepest darkness at the centre of the heart of the Sardinian land. The abyss is among the deepest single span whirlpools in Europe and legend has it that it originated from an awful struggle between a terrible snake, master of the highland of Baunei and San Pietro who wanted to free the inhabited area from the terrible animal. The final battle saw the victory of San Pietro that grabbed the reptile by the tail, beating it to earth with so much force as to form the deep abyss. As a sign of gratitude, the inhabitants of Baunei built a rural church in the vicinity of Su Sterru that is still today devoted to San Pietro.