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Due to its strategic and unique location, Mount Oshida (Kuh-e Khvājeh) in the Sistān plain, has been alternatively used since a long time ago to this date. On the southern slope of this mountain, the ruins of a palace known as Qalʿa-ye Kāferān appear after the Muslims’ arrival and domination over the region. This castle was explored and excavated during the second and third decades of the twentieth...