The Monti Lepini – protected by the Mountain Communities of Lepinis  – are composed of two main subchains: a Southwestern (the largest) and the other north-eastern, divided by deep and sunken Valley Carpinetana, real corridor between the northern and southern side which originates west of Paliano in the shrinking “of Montelanico Mouth” continues climbing for Carpineto Romano – the center of the namesake valley – up to the step of Cona Selvapiana (600 meters) and flows toward flowing south on Media dell’Amaseno Valley, at the northern boundary of the city of Privett territory.
The first chain, 30 km long, with trends from northwest to southeast, has its origins in the east of the Colli Albani and takes on a clearer definition from the summit of montelupone (1378 m); thence along the watershed (south-east), with a number of minor points: Colle Piano, The Mount, the Costa Colle, Colle Zappetella, Monte Gorgoglione (928 m), Monte Perentile (m 1022).
The altitude sequence is interrupted by Step FOTA, mule trail crossing communication between the Pontine and the inner side of the chain; then resumes share with Monte Belvedere (1258 m), Mount Capreo (1461 m), Mount Erdigheta (1336 m), after which you hang the Saddle Semprevisa (1536 m), which dominates Camporosello. From here the ridge continues to dense beech woods culminating in the peak of Semprevisa (1536 m) and then back down, to the territory of Roccagorga, with the southernmost peaks: Mount the Cross (1429 m), Monte Erdigheta (1336 m), Monte Pizzone (1313 m), Mount of Defense (923 m).
The northeastern chain, 25 km long, goes from north to south. It is formed in the area between Sgurgola and Gorga, on the border between the provinces of Rome and Frosinone, and is defined from Monte Filaro (1230 m); then proceeds through a thick theory of reliefs: Monte Favilozzo (1283 m), Rocca San Marino (1387 m), Monte Alto (1416 m), Sprone Maraoni (1328 m), Monte Malaina (1480 m); and, going beyond the Santa Serena plateau: Monte Gemma (1457 m), Monte Salerio (1439 m), Monte Acuto (827 m), Mount Sentinel (1110 m), Monte Cacume (1095 m) and Monte Calvello ( 935 m).
Beyond these two main subchains, there are ridges less relevant; in particular to the southern reaches of the main chain, towards the Pontine plain, they have a number of minor elevations: Monte arrest, Forcino Monte, Monte Fulcino, Rotondilio Monte, Monte Della Buffalo and many others.