The Iron Gate is a gorge on the River Danube forms part of the boundary between Serbia and which country?

The Iron Gate is a gorge on the River Danube forms part of the boundary between Serbia and which country?
[A]Montenegro
[B]Slovakia
[C]Romania
[D]Hungary

Romania
The Iron Gates is a gorge on the River Danube. It forms part of the boundary between Serbia and Romania.

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