Eridu is one of the earliest settlements in the region, founded c. 5400 BC during the early Ubaid period, at that time close to the Persian Gulf near the mouth of the Euphrates, although in modern times it is about 90 miles inland.
O daughter of Babylon, who art to be destroyed; happy shall he be, that rewardeth thee as thou hast served us. Psalm 137:8 KJV