Orsk (ôrsk), city (1989 pop. 271,000), Orenburg region, in the foothills of the S Ural Mts., central Russia, on the Ural River. It is the center of the Orsk-Khalilovo industrial area, which has rich iron, copper, nickel, and coal deposits. There are metallurgical and chemical plants, machine works, and a major oil refinery. Orsk was founded in 1735.
"Orsk." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (March 21, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/orsk
"Orsk." The Columbia Encyclopedia, 6th ed.. . Retrieved March 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/orsk