A Primer of Assyriology

The alluvial plain of Babylonia was the gift of the two great rivers. In the early days of Babylonian civilization they both flowed into the Persian Gulf. But salt marshes already existed at their mouths, and as time went on the marshes extended further and further to the south. What had once been sea became dry land, the silt brought down by the rivers forming an ever-increasing delta in the north of the Gulf. To-day the two rivers flow into one channel, and the point where they unite is eighty miles distant from the present line of coast. The marshes are called 'the country of Marratu' or 'the salt-sea' in the inscriptions, a name which reappears as Merathaim in Jer. 1. 21.