Etrek

The Atrak flows westward from the mountains of northern Khorasan toward the Caspian Sea. Its lower valley borders the open country north of Gorgan, a region associated with the Goklen and Yomut Turkmen. During the reign of the Safavid Shah Tahmasp I, many Goklen moved from the northern bank of the Atrak to the Gorgan River, bringing their flocks into the pastures farther south.