Muslims form a plurality of the population of the republics of Bashkortostan and Tatarstan in the Volga Federal District, and predominate among the nationalities in the North Caucasian Federal District located between the Black Sea and the Caspian Sea: the Circassians, Balkars, Chechens, Ingush, Kabardin, Karachay, and numerous Dagestani peoples. Also, in the middle of the Volga Basin reside populations of Bulgars and Bashkirs, the vast majority of whom are Muslims. Other areas with notable Muslim populations include Moscow and Orenburg Oblast, in addition to the republics of Adygea and Astrakhan Oblast in the Southern Federal District.