The Iskar Gorge is a  gorge passing through the Balkan Mountains (Stara Planina) in Bulgaria. It is the chief pass through the Balkans, which otherwise cross northern Bulgaria in a solid line.
The Iskar Gorge is a chasm that runs through the Balkan Mountains (Stara Planina) in Bulgaria, functioning as the main route through the region, which otherwise forms a continuous boundary across northern Bulgaria.