Ada Kaleh (, Turkish: Adakale "Island Fortress", Hungarian: Újorsova or Ada Kaleh, Serbian: Адакале / Adakale) 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. A Turkish exclave, it had a mosque and numerous twisting alleys, and was known as a free port and a smuggler's nest.
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