Tags: Mountain Pass.
Petrohan Pass is a mountain pass in the Balkan Mountains (Stara Planina) in Bulgaria. It connects Sofia and Montana. The pass is part of Pan-European Corridor IV. As the pass represents the shortest route between Sofia and north-western Bulgaria (and from there Romania especially since the opening of the Vidin-Calafat bridge) the expansion of the narrow road passing through the pass has been suggested including by the construction of a tunnel.