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The word "region" is taken from the Latin "regio" (derived from "regere", to rule), and a number of countries have borrowed the term as the formal name for a type of subnational entity (e.g., the "región", used in Chile). In English, the word is also used as the conventional translation for equivalent terms in other languages (e.g., the "область" ("oblast"), used in Russia alongside a broader term "регион").
regio