The Hamrin Mountains (Arabic: جبل حمرين Jabāl Hamrīn are a small mountain ridge in northeast Iraq. The westernmost ripple of the greater Zagros mountains; the Hamrin mountains extend from the Diyala Province bordering Iran, northwest to the Tigris river; crossing northern Salah ad Din Province and southern Kirkuk Province.In antiquity, the mountains were part of the frontier region between Babylonia to the south and Assyria to the north.