The Ohre is a river in northern Germany, left tributary to the Elbe. Its total length is 103 km. Its source is north of Wolfsburg, in Lower Saxony. It flows generally south-east, at first following the border of Lower Saxony and Saxony-Anhalt. After Buchhorst it flows completely through Saxony-Anhalt, along the Mittellandkanal. It flows into the Elbe in Rogätz, north of Magdeburg. The towns Brome, Calvörde, Haldensleben and Wolmirstedt lie along the river.