Arran (Middle Persian form), also known as Aran was a geographical name used in ancient and medieval times to signify an Iranian[1] region which lay within the triangle of land, lowland in the east and mountainous in the west, formed by the junction of Kura and Aras rivers,[2] including the highland and lowland Karabakh,[2] Mil plain and parts of the Mughan plain, and in the pre-Islamic times, corresponded roughly to the territory of modern-day Republic of Azerbaijan.[2] The term is the Middle Persian[3][4] equivalent to the Greco-Roman Albania. It was known as Aghvania, Alvan-k[5] in Armenian, and Al-ran[5][2] (Arabized form of Arran[3]) in Arabic.