Turshiz (Persian: ترشیز Turshēz), also known as Turaythith (طریثیث), is a medieval district and city of the Quhistan region.
It corresponds to the Kashmar area, located in the present-day Razavi Khorasan Province, Iran.
This region is divided into four regions Kashmar County, Kuhsorkh County, Khalilabad County and Bardaskan County.
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