Iskar River Gorge

The Iskar gorge is a 70 km gorge passing through the Balkan Mountains (Stara Planina). There is a road and a railway through the pass, following the course of the Iskar River. The canyon walls are made of limestone and sandstone, which was carved down by the Iskar over thousands of years, resulting in rugged crags and towers throughout. At one point, the walls are nearly 300 metres tall.