About Tshangla language

Tshangla is a Sino-Tibetan language of the Bodish branch closely related to the Tibetic languages and much of its vocabulary derives from Classical Tibetan. Tshangla is primarily spoken in Eastern Bhutan and acts as a lingua franca in the country alongside Dzongkha; it is also spoken in Indian state of Arunachal Pradesh and Tibet. Tshangla is the principal pre-Tibetan (pre-Dzongkha) language of Bhutan.