Today, Tibetan Buddhism has spread throughout the Eastern world excluding Southeast Asia. It is practiced in the Tibetan Plateau, Nepal, Bhutan, Mongolia, Kalmykia, Siberia, Russian Far East, northeast China, Arunachal Pradesh. It is the state religion of Bhutan. The Indian regions of Sikkim, Ladakh, Himachal Pradesh, West Bengal are also home to small Tibetan Buddhist populations. 