The Iron Gates is a gorge on the Danube River. It forms part of the boundary between Serbia and Romania. The broader Donji Milanovac forms the connection with the Great and the Small Kazan gorge, which have a combined length of 19 km. The Great Kazan kazan meaning `cauldron` or `reservoir` is the most famous and the most narrow gorge of the whole route: the river here narrows to 150 m and reache