Marl is a town and a municipality in the district of Recklinghausen, in North Rhine-Westphalia, Germany. It is situated near the Wesel-Datteln Canal, approx. 10 km north-west of Recklinghausen. It has about 90,000 people.

The Lippe is a river in North Rhine-Westphalia, Germany. It is a right tributary of the Rhine and 220.3 km (136.9 mi) in length with an elevation difference of 125 metres and a catchment area of 4.890 km². The source is located at the edge of the Teutoburg Forest in Bad Lippspringe close to the city of Paderborn. It runs westward through Paderborn, Lippstadt and then along the northern edge of the Ruhr area, parallel to the river Emscher and river Ruhr. The river finally enters the Rhine at Wesel.