Tamang is a term used to collectively refer to a Sino-Tibetan language cluster spoken mainly in Nepal, Sikkim, West Bengal (Darjeeling) and North-Eastern India. It comprises Eastern Tamang, Northwestern Tamang, Southwestern Tamang, Eastern Gorkha Tamang, and Western Tamang. Lexical similarity between Eastern Tamang and other Tamang languages varies between 81% and 63%. For comparison, the lexical similarity between Spanish and Portuguese is estimated at 89%.