Islam is the second-largest religion in Russia, and it is the traditional religion amongst the bulk of the peoples of the North Caucasus, and amongst some Turkic peoples scattered along the Volga-Ural region. Buddhists are home to a sizeable population in the three Siberian regions: Buryatia, Tuva, Zabaykalsky Krai, and in Kalmykia; the only region in Europe where Buddhism is the most practised religion.