Iran–Turkmenistan border

largest landlocked salt lake, located between Europe and Asia

river in Afghanistan, Iran and Turkmenistan

The Atrek (, , ), also known as the Attrack, Atrak, and Etrek, is a fast-moving river which begins in the mountains of north-eastern Iran () and flows westward, draining into the south-eastern corner of the Caspian Sea in Turkmenistan. Because of the high use of its waters for irrigation, the Atrek only flows into the Caspian when it is in its flood stage.

separates the territories of Iran and Turkmenistan

dam on the Hari River on the border of Iran and Turkmenistan