The Iron Gates (Romanian: Porțile de fier, Serbian: Ђердапска клисура) is a gorge on the Danube River between Romania and Serbia. A bridge over the Danube here forms a border crossing between the two countries. The closest city in Romania is Drobeta-Turnu Severin and the closest town in Serbia is Kladovo.
Walking across this border is not permitted, but you can approach drivers who are queueing to cross the bridge.
It is best to walk a few hundred metres further from passport control to where the road splits. At this intersection you can either hitch north (the road drivers take to Belgrade) or south towards Kladovo.