What is "mihrajanqadhaq"

Mihrajanqadhaq or Mihrajan Qashaq, originally know by its Middle Persian name of Mihragan-kadag, was the name of a district and province in the western Jibal, on the borders with Iraq, in the early Middle Ages. Its capital was the town of Saymarah. Various Arab geographers note that the district was fertile and populous. By the 14th century, the town of Saymarah was falling in ruin, and is now deserted.