Tibetan Buddhism is the body of religious doctrine and institutions characteristic of Buddhism in  Tibet, Mongolia, Tuva, Bhutan, Kalmykia, Buryatia and certain regions of the Himalayas, including northern Nepal, and India (particularly in Arunachal Pradesh, Ladakh, Dharamsala, Lahaul and Spiti district in Himachal Pradesh and Sikkim). It is the state religion of Bhutan. It is also practiced in Mongolia and parts of Russia (Kalmykia, Buryatia, and Tuva) and Northeast China. Religious texts and commentaries are contained in the Tibetan Buddhist canon such that Tibetan is a spiritual language of these areas. Tibetan Buddhism preserves the Vajrayana teachings of eighth century India. Tibetan Buddhism aspires to Buddhahood or rainbow body.