The middle stretch of the stream Ussita consists of a pretty canyon with a perennial water flow. The canyon begins with a sequence of five waterfalls, commonly called Callarelle Falls. The same is located in the heart of the most intact part of the Sibillini Mountains National Park, surrounded by an unspoilt nature, at the foot of the impressive northern side of "Monte Bove"; here flow the waters that have shaped the gorges.

Due to the earthquake occurred in 2016, the area can't be crossed.