Aspects of this topic are discussed in the following places at Britannica.
...and 300 miles (500 km) from north to south. It is bordered on the north by the Sarykamysh Basin, on the northeast and east by the Amu Darya (ancient Oxus River) valley, and on the southeast by the Garabil uplands and Badkhyz steppe region. In the south and southwest the desert runs along the foot of the Kopet-Dag Mountains, and in the west and northwest it borders the course of the ancient...
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