 Their northern extend lay beyond Murgenella Creek and in the vicinity of Cooper Creek, while their southern frontier was close to the East Alligator River.According to the widespread creation story of the Cobourg Peninsula dreamtime, the Amarak (Umoriu) descended from Imberombera deposited who children at a place neer Cooper Creek known as "Mamul".One of the children was called "Kominuuru", and, on leaving, she told them to speak Amurdag, and an edible bulb called .