Ellasar

the oak or heap of Assyria, a territory in Asia of which Arioch
was king (Gen. 14:1, 9). It is supposed that the old Chaldean
town of Larsa was the metropolis of this kingdom, situated
nearly half-way between Ur (now Mugheir) and Erech, on the left
bank of the Euphrates. This town is represented by the mounds of
Senkereh, a little to the east of Erech.