Following the Oker

The Oker River splits and flows right around the old centre of Braunschweig and presumably the old city wall must have been just inside it (it was dismantled in the 1800's and turned into buildings and parks).  It was nearly a 9km walk for us today to follow the river around the old city. The Oker runs out to the North sea and is navigable right up to Braunschweig.