From the longer Wikipedia page [1] Bow Back Rivers or Stratford Back Rivers is a complex of waterways between Bow and Stratford in east London, which connect the River Lea to the River Thames. Starting in the twelfth century, works were carried out to drain Stratford Marshes and several of the waterways were constructed to power watermills. Bow Creek provided the final outfall to the Thames, and the other channels were called Abbey Creek, Channelsea River, City Mill River, Prescott Channel, Pudding Mill River, Three Mills Back River, Three Mills Wall River and Waterworks River.