National delimitation in the Soviet Union refers to the process of creating well-defined national territorial units (Soviet socialist republics – SSR, autonomous Soviet socialist republics – ASSR, autonomous oblasts (provinces), raions (districts) and okrugs from the ethnic diversity of the Soviet Union and its subregions. The Russian term for this Soviet state policy is razmezhevanie (, natsionalno-territorialnoye razmezhevaniye), which is variously translated in English-language literature as national-territorial delimitation, demarcation, or partition. National delimitation is part of a broader process of changes in administrative-territorial division, which also changes the boundaries of territorial units, but is not necessarily linked to national or ethnic considerations. National delimitation in the Soviet Union is distinct from nation-building , which typically refers to the policies and actions implemented by the government of a national territorial unit (a nation state) after delimitation. In most cases National delimitation in the Soviet Union was followed by korenizatsiya.