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In page Geography of Russia:

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The republics include a wide variety of peoples, including northern Europeans, Tatars, Caucasus peoples, and indigenous Siberians.[citation needed] The largest federal subjects are in Siberia. Located in east-central Siberia, the Sakha Republic (Yakutia) is the largest federal subject in the country (and the largest country subdivision in the world), twice the size of Alaska. Second in size is Krasnoyarsk Krai, located west of Sakha in Siberia. Kaliningrad Oblast, which is a noncontiguous constituent entity of Russia, is the smallest oblast. This is both the smallest republic and the smallest federal subject of Russia except for the three federal cities. The two most populous federal subjects, Moscow Oblast (with Moscow) and Krasnodar Krai, are in European Russia.