The word may derive from the name of a Persian town, Damghan, but this is not supported by any historical evidence.
Improper Khorasan's boundaries extended to Kabulistan and Hazarajat in the east, Sistan and Baluchistan in the south, Transoxiana and Khwarezm in the north, and Damghan and Gorgan in the west.
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The boundary between these two was the region surrounding the cities of Gurgan and Damghan.
In 1508 Sheibani Khan subjugated other cities of Khorasan: Damghan, Astrabad, Mashhad, etc.
Jajarm, Damghan, Simnan, and Gurgan were then occupied, and Togha Temur and his personal following fled to Mazandaran.
Damghan |