The oasis reagon and the name Hajar (also Hagar, Haǧar) specifically may be related to the Ancient Near East toponym Agarum, mentioned in Dilmunite inscriptions as the original home of their chief deity Inzak. If so, Agarum probably referred to the mainland Arabia opposite of Bahrain. According to the hypothesis, the Dilmun civilization originated at the oases of Eastern Arabia, but later relocated to the isle of Bahrain. This interpretation is not without criticism, however, and other sources place Agarum on the isle of Failaka.