Indigenous peoples of the region include the ethnic Mazanderanis speaking an Iranian Language which most resembles Gilaki and Sangiseri.
Mazanderani (in Mazandarani: Mäzeruni) or Tabari is an Iranian Language of the Northwestern branch, spoken mainly in Iran's Mazandaran, Tehran and Golestan such as Mazanderani, and Gorgani and possibly Qadikolahi (Ghadikolahi) and Palani.
Today, Mazandaranis also use Persian (Western Persian). The educated can communicate and read Persian well As a member of the Northwestern branch (the northern branch of Western Iranian), genetically speaking it is rather closely related to Gilaki, and more distantly related to Persian, which belongs to the Southwestern branch.
A Dialect of Azeri is spoken in the town of Galoogah.
Reference: wikipedia.org
