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Quhistan (Persian: قهستان‎) or Kohistan (کهستان, "mountainous land") was a region of medieval Persia, essentially the southern part of Khurasan. Its boundaries appear to have been south of Khorasan to north, Yazd to West, Sistan to South, Afghanistan to East. Ghohestan was a province in old days with a rich history in Persian literature, art and science. Notable historical towns include Ferdows, Qaen, Gonabad, Tabas, Birjand, Kashmar, Khac, Taybad, and Torbat-e Heydarieh. It is home to famous castles. Safron, berberies (Zereshk) and jujube (Annab) are among the famous agricultural products that are exclusively produced in Ghohestan. Hakim Nezari Ghohestani,[1] Sima Bina[2][circular reference] and Professor Reza Ghohestani[3] are among famous people who are originally from Ghohestan.

Dagestan in the North Caucasus was priorly and originally named "Quhistan", which has the same meaning as Dagestan: dağ and kuh are the Turkic and Persian words for "mountain", respectively. -istan is Persian suffix meaning "land [of]".