Tamang is a term used to collectively refer to a dialect cluster spoken mainly in Nepal and parts of Sikkim. 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% to 63%; lexical similarity between Spanish and Portuguese, for instance, is estimated at 89%. Wikipedia
Nepal