The Tibetan language is spoken in all three provinces of Tibet including U-Tsang, Kham and Amdo which has an area around six times that of England. The Tibetan language is also used in the Himalayan regions such as Walung, Solo Khumbu, Yolmo, Lho Manthang, Nyeshang, Limi, Humla, Jumla, etc. in Nepal, Ladakh, Zanskar, Lahaul-Spiti, Sikkim, Arunachal Pradesh, etc in India, northern parts of Pakistan such as Baltistan, whole Bhutan, northern parts of Burma. Tibetan language is widely used in Mongolia, several parts of Russia.
Unfortunately it serves no purpose for me except academic interest