The peaks have an average height of 2,000 m, the highest being the Mount Passeggio (2,064 m).

At the base of the Ernici Mounts is the cave of La Foce with a spring outflow in the Aniene river.

[1] The mountain range takes its name from the Hernici, an ancient Italic population of Osco-Umbrian language who lived in the area.

The Monti Ernici range serves as the natural border between Lazio and Abruzzo, with western slopes being more intricate and less steep compared to the direct and steep eastern slopes.

On the Abruzzo side, the Zompo Lo Schioppo nature reserve lies within Morino's territory.