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Sibir (sĭbērˈ), former city, southeast of present-day Tobolsk, W Siberian Russia. Founded in the 11th or 12th cent., it became (early 16th cent.) the capital of the Tatar khanate of Sibir, which arose after the disintegration of the empire of the Golden Horde. The Cossack Yermak took the city of Sibir in 1581, thus marking the start of Moscow's conquest of what is now Siberia. The city was abandoned after the founding of Tobolsk in 1587.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a river in Bulgaria, a right tributary of the Danube. Length, 368 km; basin area, 8,600 sq km.

The river rises in the Rila Mountains. In its upper reaches it flows through the Samokov and Sofia basins, then intersects the Stara Planina (Balkan Mountains) via the Isker Gorge and in its lower course traverses the Walachian Plain. High water is in spring, low water in summer. The average rate of flow at the mouth is 54 cu m per sec, and the maximum, in years of abundant flow, is 800 cu m per sec. The basin of the Isker contains reservoirs and hydroelectric power plants. Situated on the Isker are the cities of Samokov, Mezdra, and Cherven-Bryag; the river also flows through the eastern outskirts of the Bulgarian capital, Sofia.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Then came isker e the Adebayor challenge which left Cazorla in a heap and with Webb's flash of red Arsenal's comeback had begun.
Heckman, Andrew Johann Isker, Julie Kent, Gina Michelle Martino, Kelly Grace McBride, Joseph Mikolai, Justin Petersen, Josh Peterson, Jessica Rust, Shannon M.
Mouffok Waguih Takla DI: Aniss Sassi Lounes Tazairt Yasine Sassi Akim Isker Yacine's friend Aissa Fabien Busetta Tiziri Lynda Harchaoui Nounou Kamel Abdelii (French dialogue, Arabic songs) Just another soap opera in less deft hands, Nadir Mokneche's "Viva Laldjerie" jumps off the screen with humor, poignancy and local color.
Isker III ( wants the entire Apollo film archive on a CD-ROM or DVD.
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Mahreche Maamar (69 kg), Bourenna Malek (60 kg) et Isker Abdelkrim (75 kg) ont beaucoup de qualites et pouvaient pretendre a une place en finale, mais malheureusement cela n'a pas ete le cas.Nous allons tenter d'aller le plus loin possible dans ce tournoi final avec l'espoir de monter sur le podium[beaucoup plus grand que], a-t-il fait savoir.