The Gilaki language is a Caspian language, and a member of the northwestern Iranian language branch, spoken in Iran's Gilan Province. Gilaki is closely related to Mazandarani and the two dialects have similar vocabularies. The Gilaki and Mazandarani languages (but not other Iranian languages) share certain typological features with some Caucasian languages, reflecting the history, ethnic identity, and close relatedness to the Caucasus region and Caucasian peoples of the Gilaki people and Mazandarani people.