Monte Cairo

From the square at the entrance to Terelle take the narrow paved road up to the right, then turn right following signs for the Croce forestry refuge and park near a ruined building at about 1,109 m. Walk along the dirt track to a barrier; do not pass it but keep right to the old quarry of Cava di Rena, where CAI path 821 starts. This path, waymarked by CAI Cassino and built by the Terelle municipality, crosses beech woods with two rest areas and information panels, and beyond the burned forest joins the old path 820. From the junction the path climbs at a moderate gradient to the broad final ridge, crossing grass along the edge of the beech wood to a large cross and, just beyond, the summit pillar and register (1,669 m). The views take in the Liri valley, the Aurunci mountains, the peaks of the Abruzzo National Park and the Meta group, and on clear days the Tyrrhenian Sea; the abbey of Montecassino is visible below. A 30-minute return extension leads to the western end of the ridge (about 1,631 m) above Colle San Magno. CAI Frosinone gives 1 h 50 min up and 1 h 30 min down for about 9 km and 560 m of ascent; descend the same way. The old route from the Casermette refuge through the pine forest has been impassable since about 2022 after a fire (fallen trees and brambles), so ignore older descriptions that use it. Remains of German wartime positions and trenches can be seen near the ridge.