Distribution of the Azerbaijani language in the Caucasus and vicinity.
Own work.

Based on the sources listed below:
Atlas of the Languages of Iran by Geomatics and Cartographic Research Centre (GCRC) at Carleton University
Ethnic Groups of the Middle East by Dr. Mehrdad Izady
Ethno-Linguistic Groups in the Caucasus and Vicinity by Dr. Mehrdad Izady
Golden, based on File:Idioma azerí.png by User:Fobos92