The upper reaches are known as the Sosio, fitting the Verdura after it is joined by the Lisandro. It is 53 km (33 mi) long, with a catchment area of 422 square km (163 sq mi). There are two hydroelectric dams, at Cristia and Favara. The fertile valley produces navel oranges, almonds, wine and olive oil.
- Fulco di Verdura, jeweller, and the last person to bear the now-defunct Sicilian ducal title of Verdura.