The Lesum is a river in northern Germany, right tributary of the Weser, navigable for Class III ships. It is formed at the confluence of the rivers Wümme and Hamme, near Ritterhude, northwest of Bremen. It flows west and flows into the Weser in Bremen-Vegesack. See also List of rivers of Bremen List of rivers of Lower Saxony References Rivers of Bremen (state) Rivers of Lower Saxony Federal waterways in Germany Rivers of Germany