course is the Heubach, which splits up into the Umflut and the river now called Halterner Mühlenbach. The Umflut later reunites with the Halterner Mühlenbach...

9 mi) in length, and at about its midpoint crosses the Köthener See. The Umflut Canal opens up the nearly 200 km long Märkische Runde with the two aforementioned...