Ada Kaleh was a small island on the Danube populated mostly by Turks that was submerged during the construction of the Iron Gates hydroelectric plant in 1970. The island was about 3 km downstream from Orşova and measured 1.75 by 0.4–0.5 km.
The isle of Ada Kaleh is probably the most evocative victim of the Iron Gate dam's construction. Once an Ottoman Turkish exclave, it had a mosque and numerous twisting alleys, and was known as a free port and a smuggler's nest.
BU-F-01073-5-01949-2 Intrare în fortăreaţa de pe insula Ada Kaleh (insulă pe Dunăre, acoperită în 1970 de apele lacului de acumulare al hidrocentralei Porțile de Fier I), s. d. (sine dato) (niv.Document)