Today, Tibetan Buddhism is adhered to widely in the Tibetan Plateau, Mongolia, northern Nepal, Kalmykia (on the north-west shore of the Caspian), Siberia (Tuva and Buryatia), the Russian Far East and northeast China. It is the state religion of Bhutan. The Indian regions of Sikkim and Ladakh, both formerly independent kingdoms, are also home to significant Tibetan Buddhist populations, as are the Indian states of Himachal Pradesh (which includes Dharamshala and the district of Lahaul-Spiti), West Bengal (the hill stations of Darjeeling and Kalimpong) and Arunachal Pradesh. Religious communities, refugee centers and monasteries have also been established in South India.