The territory of Ussassai, particularly in the north and east, is studded with the characteristic taccus, buttes: outcrops of limestone rock, in part still shrouded by dense forests of oaks, arbutus, heath, holly and juniper. The most characteristic is the limestone complex of Su Casteddu’e Jeni-situated north-west with its pinnacles and bizarre shapes, which dominates the valley below, creating a scenery with the suggestive fascination of a far-west landscape.

In the territory of Ussassai there are numerous archaeological monuments testifying to the various prehistorical and historical periods. Among them, some domus de janas (Perdobia, Aurraci, Forrus) which date back to the pre-Nuragic times and about ten nuraghi, the most interesting of which are Nela, Is coccorrnis, Taccu Addai, and Nuragi.

The most important and better preserved monument is the country church of San Salvatore: a construction in the Roman-Byzantine style dating back to the 12th century. Tradition indicates it as the church of a village-Trobigitei-existing in the area in medieval times that disappeared during the Spanish domination. The church is surrounded by a semicircle of is cumbessias, characteristic one-room dwellings made of stone . Here pilgrims used to find and still do shelter during the celebrations in honour of S. Salvatore and S. Gerolamo.

Numerous forests shroud the territory of Ussassai, among those worth mentioning are Takigeddu and Taccu mannu. There are also many water springs at the foot of these limestone mountains. The most popular ones are at Niala and  Milisai, destinations of holiday-makers and tourists who enjoy spending the day in the shade. Su pissu’e Irtzioni renowned for the presence of ponte di ferro (an iron railway bridge), and for the proximity of Niala .Nearby is Su Tuvu nieddu, where the torrent on its course towards the San Girolamo river has carved a natural bridge out of the limestone rock: Su Casteddu’e Jeni, Sa Preanedda, Nilisai, Sa Uca’e ir Bobois.