another important thing to note about the Dvina river is, of course, the fact that it constitutes a geographic underpinning of Reisen, which is (not the same as the current White Russia although they share the same name in Hebrew רוסיה לבנה, but) a rather narrow strip of land along the Dvina river from west to east and along the Dnepr river from north to south (essentially the same land that Russia took in the 1st partition of Poland).
so in all fairness, the title should really be "By the rivers of Reisen..."
another important thing to note about the Dvina river is, of course, the fact that it constitutes a geographic underpinning of Reisen, which is (not the same as the current White Russia although they share the same name in Hebrew רוסיה לבנה, but) a rather narrow strip of land along the Dvina river from west to east and along the Dnepr river from north to south (essentially the same land that Russia took in the 1st partition of Poland).
so in all fairness, the title should really be "By the rivers of Reisen..."
Yes, but Reisen doesn't rhyme with Babylon. This was the goal, to evoke posuk.