This documentary takes a look at the Hase, a river that flows through the Osnabrück Land in Germany. The 'Flow of the Hase' shows entertainingly with historic scenes how the requirements on the river changed through time. Today there is a great effort to renaturalize the Hase. 10 interviewees get a chance to speak: Some work professionally with the Hase, others get a special quality of life because of the river.