It is approximately 62 kilometres long, running from its source near the village of Kasseedorf in Ostholstein to Kiel where it flows into the Kieler Förde, a bay of the Baltic Sea.
It is approximately 62 kilometres long and rises on the highest point in the state, the hill of Bungsberg, near the village of Kasseedorf in Ostholstein. It then runs from its source to Kiel where it flows into the Kiel Fjord, a bay of the Baltic Sea.