The oriented Nature Reserve of Cavagrande Cassibile is an oriented regional nature reserve of Sicily, rich in scenic, anthropological, archaeological, hydrological and speleological, significance. The area extends over 2700.00 hectares, divided between the 900.00 ha of area A (reserve) and 1860.00 ha of area B (preriserva). The reserve was established in 1990 (DA, 13 July) and is managed by the Forestry Demaniali of the Sicilian Region.

It is crossed by the river Cassibile (called Kacyparis in ancient greek) which over the millennia has created a series of deep canyons. In the valley, has come to create a complex system of small waterfalls and invaded natural (locally called uruvi) often bathing. The largest proportion reached dall'altipiano than the bed of the river is 520 m above sea level, but it is close to the viewpoint of Avola Antica, which, with its 507 meters, the river reaches the maximum depth. Also in this section reaches the maximum width of 1200 meters. In the 10 km length of the canyon, as mentioned, you can admire several small lakes, with fresh and limpid water, among which stand out as beautiful small lakes around Avola Antica accessible to the public through a historic scale, called Scala Cruci.