The Great Balkhan Range in the west of the country (Balkan Province) and the Köýtendag Range on the southeastern border with Uzbekistan (Lebap Province) are the only other significant elevations. The Great Balkhan Range rises to  at Mount Arlan and the highest summit in Turkmenistan is Ayrybaba in the Kugitangtau Range – . The Kopet Dag mountain range forms most of the border between Turkmenistan and Iran.