city, Moscow oblast (province), western Russia. It lies southeast of Moscow near the confluence of the Moskva and Oka rivers. First mentioned in 1177, Kolomna formed a key stronghold on Moscow's southern frontier; it was sacked four times by the Tatars. Kolomna was one of the earliest Russian locomotive-building centres, and today diesel engines, heavy machinery, and synthetic rubber are produced. Pop. (1991 est.) 163,500
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