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Carpathian Mountains, a geologically young European mountain chain forming the eastward continuation of the Alps. From the Danube Gap, near Bratislava, Slovakia, they swing in a wide crescent-shaped arc some 900 miles (1,450 kilometres) long to near Orşova, Romania, at the portion of the Danube River valley called the Iron Gate. These are the conventional boundaries of these arcuate ranges, although, in fact, certain structural units of the Carpathians extend southward across the Danube at...