The Old River forms a large meander from the Middlesex Filter Beds Weir to rejoin the main channel of the River Lee Navigation below Old Ford Lock.

[1] The natural channel is joined by the River Lee Flood Relief Channel, and Dagenham Brook and a number of subsidiary channels to form the semi-tidal Bow Back Rivers, discharging into Bow Creek.

The natural channel forms the boundary between the London Boroughs of Hackney and Waltham Forest; and forms the eastern boundary of Hackney Marshes, and historically the western boundary of Leyton Marshes.

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