This walk with Rob Smith along the River Lea takes us through the Olympic Park, passing London Stadium and many former industrial sites before reaching the beautiful tide mills at Bow. It then takes us to Canning Town to see the last loops of the Lea before it joins the Thames at Trinity Buoy Wharf. The Lea is one of the longest and most important tributaries of the Thames. It has formed the boundary between the Saxons and the Danes, been home to medieval mills and numerous other industries. This is one of series of walks by Rob which will look at the history of the River Lea, tracing its 42-mile course to the Thames.