It was formed by the congestion of the Saratogh river. It is 134 km from Dushanbe and 23 km from the Dushanbe—Khujand road.
The lake takes its name from Alexander Zulqarnain: Iskander is the Persian pronunciation of Alexander, and kul is lake in turkic.
The outflow of the lake is the Iskander Darya, which joins the Yaghnob River to form the Fan Darya, a major left tributary of the Zeravshan River.
The location of Sarez Lake in Tajikistan: