The border starts in the north at the tripoint with Georgia just west of Lake Arpi and proceeds southwards via series of irregular lines through the Armenian Highlands. Upon reaching the Akhurian River it follows the river south down to the confluence with the Aras river, and then follows the Aras as it flows east and then south-east, down to the tripoint with Azerbaijan's Nakhichevan Autonomous Republic. The ancient ruins of Ani lie directly adjacent to the border on the Turkish side.