The position of Ulassai, located at the foot of the Tacchi, amid and dolomite-like landscape, is absolutely unique. The Tacchi are uplands of calcareous origin with sheer vertical walls standing out against the neighbouring mountains. They are the most original element of the Ulassai territory, with a landscape that cannot be found in other areas of Ogliastra, or in the whole island.  Forests of evergreen and other typical Mediterranean species cover most of the Tacchi. In many places water courses and streams surface during the rainy season creating waterfalls such as those of Lecorci and Lequarci.

At the foot of the Tacchi, just above the Lecorci waterfalls is Su Marmuri, one of the largest and most imposing grottoes in Sardinia, 100 meters long with a variable height of 30 to 50 meters. The imposing entrance, the ample inner chambers, the variety of the rock, the many shades of colours and the dimensions of the stalactites and stalagmites are most impressing.

The village symbol is the Arch of “Barigau”, a majestic monument which represents the last trace of an ancient wall now completely disappeared. Worth a visit are the sculptures by Mario Lai, Costantino Nivola and others that blend harmoniously with the traditional style of the village dwellings and the surrounding landscapes.

For those who wish to enjoy the unspoilt nature of these places, there are numerous recently made climbing routes and  old paths that were used in the past by shepherds and charcoal burners. The well signposted paths run along breathtaking cliffs and through evergreen woods.

Giants’ tombs and nuragic constructions, some well-preserved, are scattered over the territory often near isolated nuraghi as well as  traces of Roman settlements at:Girisaili, Neuletta, Testerei, Cuili de is iligis ladas, Godditorigius, Cuccuru de Maraccus.