It was located in the valley of the river Murghab which has its sources in the mountains of Afghanistan, and passes through Murghab District in modern Afghanistan, and then reaches the oasis of Merv in modern Turkmenistan.
The Murghāb River (Persian/Pashto: مرغاب), also called Margos, Margu and Margiana River (Old Greek: Μαργιανή), and also transliterated as Murgab (from Russian Мургаб) and Murgap (from Turkmen), is an 850 km long river in Central Asia.