Iskŭr ĭs´kĕr [key], river, c.250 mi (400 km) long, rising in the Rhodope Mts., W Bulgaria, and flowing generally NE past Sofia and through the Balkan Mts. to the Danube River. The gorge of the Iskŭr is one of the chief passes through the Balkans.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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