Seversk (Russian: Се́верск, IPA: [ˈsʲevʲɪrsk]) is a closed city in Tomsk Oblast, Russia, located 15 kilometers (9.3 mi) northwest of Tomsk on the right bank of the Tom River. The population was 108,590 at the 2010 census and 109,106 at the 2002 census.
It was previously known as Pyaty Pochtovy (until 1949) and Tomsk-7 (until 1992).
A closed city or closed town is a settlement where travel or residency restrictions are applied. Historically, the construction of closed cities became increasingly common in the Soviet Union during the Cold War. Since the dissolution of the Soviet Union in 1991, they remain widespread in Russia and some of the other post-Soviet countries. In modern Russia, closed cities are designated as "closed administrative–territorial formations".
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