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Wikipedia definition
1. Closed cityA closed city or closed town is a settlement with travel and residency restrictions in the Soviet Union and some of its successor countries. In modern Russia, such places are officially known as "closed administrative-territorial formations" (закрытые административно-территориальные образования, zakrytye administrativno-territorial'nye obrazovaniya, or ZATO ЗАТО for short).
Read “Closed city” on English Wikipedia
Read “閉鎖都市” on Japanese Wikipedia
Read “Closed city” on DBpedia

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