photo: Vladimir Nojkovic (Mali Kazan)

The Danube passes through three canyon-gorge valleys: Golubacka, 14.5 km long and 230 m wide at the narrowest point, Gospodin Vir, 15 km long and 220 m wide at the narrowest point and Canyon of Veliki Kazan and Mali Kazan, 19 km long and 150 wide at the narrowest point.