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Diyar Rabī‘a encompasses the upper reaches of the river Khabur and its tributaries, i.e. the regions of Tur Abdin and Beth Arabaye, as well as both shores of the river Tigris from the vicinity of Jazirat ibn Umar in the north to the boundary with Iraq in the area of Tikrit in the south, including the lower reaches of the Upper Zab and Lower Zab.
According to the hagiographical Syriac Life of John of Dailam, John was born in Ḥdattā, a town on the confluence of the Upper Zab and the Tigris, in 660 A.D.