Arsaces was proclaimed king at Asaak in the district of Astauene, now Kuchan in the upper Atrek (Attruck) valley (Isidor.
Near its south-east corner the Caspian is entered by the Atrek, which drains the mountain ranges of the Turkoman (N.E.) frontier of Persia.
M., and the Sefid-rud and the Atrek, both relatively short.
East of the Caspian Sea and beginning at Has an Kuli Bay the river Atrek serves as the frontier as far as Chat.
Four rivers belonging essentially to Persia, in reference to the Caspian watershed, are the Seafid Rud or Kizil Uzain on the southwest, the Herhaz on the south and the Gurgan and Atrek at the south-eastern corner of that inland sea.
The Atrek rises a few miles from Kuchan and enters the Caspian at the Bay of Hassan Kuli in 37 21 N., after a course of about 300 m.
ATREK, a river which rises in 37° to' N.
The Kuren Dagh and Ala Dagh enclose the valley of the Atrek River, which flows west and southwest into the Caspian at Hassan Kuli Bay.
The western offshoots of the Ala Dagh in the north and the mountains of Astarabad in the south enclose the valley of the Gurgan River, which also flows westwards and parallel to the Atrek to the southeastern corner of the Caspian.
Beyond the Atrek and other rivers watering the northern valleys a few brackish and intermittent rivers lose themselves in the Great Kavir, which occupies the central and western parts of the province.