a fortified town of Asiatic Russia, government of Tobolsk, stands on a barren sandy plain, at the confluence of the Om with the Irtish, 280 miles S.E. of Tobolsk; N. Lat. 54° 53', E. Long. 72° 54'. It is well built, and contains, besides several churches, a governor's house, hospital, a military school, and a college for the education of interpreters for the army, in which the languages are taught. Manufactures of military clothing are carried on here; and here caravans start for Tashkend and Bokhara in Turkestan. The fortifications are modern, regularly constructed in the form of a polygon, and flanked by five bastions. Omsk was formerly the capital of a separate government, which has been divided between those of Tobolsk and Tomsk. Pop. 11,705.