Iron Gate
- a gorge through which a section of the River Danube flows, forming part of the boundary between Romania and Serbia. Navigation was improved by means of a ship canal constructed through it in 1896. Romanian name PORŢILE DE FIER, Serbo-Croat name GVOZDENA VRATA.铁门（多瑙河在塞尔维亚和罗马尼亚边境线上的一段狭窄的峡谷; 1896年沿该峡谷建成的运河大大促进了通航; 罗马尼亚语名PORŢILE DE FIER,塞尔维亚-克罗地亚语名GVOZDENA VRATA）。