Monte Buio, Mountain summit in the Ligurian Apennines, Italy

Monte Buio is a grassy, pyramid-shaped mountain of the Ligurian Apennines reaching 1,400 m, set between the provinces of Genoa and Alessandria. A large cross stands on its summit. Its slopes fall into the Brevenna, Borbera (Berga gully) and Vobbia valleys, on the western ridge of Monte Antola, and it visually dominates the Val Vobbia.

The mountain has long served as a geographic marker for surrounding communities and helped define boundaries between regions. In 1989, the Ligurian side was incorporated into the Antola Regional Natural Park, formalizing its protection.

The name Buio comes from the root boi, found in nearby toponyms such as Bobbio and Monte Bogleglio, and is linked to the ancient Gallic Boi people. The grassy pyramid-shaped summit carries a large cross, and the mountain is a tripoint of the Brevenna, Borbera and Vobbia valleys.

Several hiking paths lead to the summit from different starting points including Alpe, Vallenzona, and Tonno in Valbrevenna, as well as via the mountain passes of Incisa and San Fermo. The best time to visit is May through October when weather conditions are more stable and paths remain easily accessible.

Monte Buio is a tripoint: the valleys of the Brevenna, the Borbera (Berga stream) and the Vobbia meet at its summit. A short ridge links it to Monte Antola and carries the Ligurian Sea–Adriatic Sea water divide, so the ridge, not the grassy pyramid itself, is the watershed line.