Talysh Mountains (Persian: کوههای تالش‎ Kuha: e Ta:lesh, Azerbaijani: Talış dağları) is a mountain range in northwestern Iran and southeastern Republic of Azerbaijan. The range forms the northwest section of the Elburz Mountains, extending southeastward from the Lankaran Lowland in southeast Azerbaijan to the lower part of the Sefid Rud (White River) in northwest Iran.