This name was also used for what Chinese sources call the Tiemenguan, a passage on the road to Samarkand that supposedly kept the Western Turks from invading the land of the Tokharians.
This is an alternate name for the pass of Biban in central Algeria, where Marshal Valee's movement of a French army in 1839 caused the breakdown of the Treaty of Tafna.  This name was also used for what Chinese sources call the Tiemenguan, a passage on the road to Samarkand that supposedly kept the Western Turks from invading the land of the Tokharians. A third feature with this name include the now-submerged Turkish smuggler island of Ada Kaleh and the Mesolithic village site of (*) Lepenski Vir. The Derdap National Park preserves part of a feature with this name, where many historic sites were submerged by two  ►  Ceausescu-era hydroelectric dams. For 10 points, give this name shared by a gorge of the River Danube on the border between Serbia and Romania.
This is an alternate name for the pass of Biban in central Algeria, where Marshal Valee's movement of a French army in 1839 caused the breakdown of the Treaty of Tafna.  
Iron Gate (or Iron Gates or Gates of Iron)