Snow lies in some of the gorges all the year round.
These issue in magnificent streams through three gorges in the frontier hills.
Three main valleys, known respectively as Hinde, Gorges and Hobley valleys, run down from this to the east, and four - Mackinder, Hausberg, Teleki and Hbhnel - to the west.
Sometimes they occupy the approaches to tablelands, the narrowest points of gorges, or the fords of rivers; sometimes almost inaccessible mountain tops or important points on ridges; and it may be noticed that, where two important nuraghi are not visible from one another, a small one is interpolated, showing that there was a system of signalling from one to another.
Descending rapidly from its source, sometimes over cascades, the river soon enters deep gorges through which it flows as far as Beaulieu (department of Correze) where it debouches into a wide and fertile valley and is shortly after joined by the Cere.