Murgab mo͝orgäb´ [key], river, 530 mi (853 km) long, rising in the Paropamisus range, NE Afghanistan, flowing NW into Turkmenistan, to the Merv oasis, and disappearing into the Kara Kum desert, SE Turkmenistan; it forms part of the Afghanistan-Turkmenistan border. With the Kusht, its main tributary, the river is an important source of water; irrigation dams are at Tashkepristroi and Iolotan. An alternate spelling is Morghab.
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