the Hafen der Zeche Friedrich der Große (Frederick the Great mine port). The harbor basin was built from 1897 to 1898 when the section of the canal (the then branch channel of the Dortmund-Ems Canal), was already flooded. In 1912, at the colliery port handled 360,096 tonnes of goods. In 1913 the docks expanded. Because of mining subsidence by 1954 the quaywall had to be increased by . In the 1980s, it was leased to Automobil- und Motorbootsport-Club Castrop-Rauxel e. V (The car and motorboat club of Castrop-Rauxel) and is used from recreational boating, being no longer used by Ruhrkohle AG, and contains many small boats. The former mine railway, which starts at the harbour is now a walking and biking trail. Port Victor The Victor Harbor (Hafen Victor) was created to serve the former colliery 'Victor' which finished all operations in 1973. The port is in the city of Castrop-Rauxel in the vicinity of Schloss Bladenhorst (Castle 'Blade Horst'), about upstream from the Hafen der Zeche Friedrich der Große also on the south bank. Today the port still handles coal with the help of two gantry cranes. Port Rütgers Port Rütgers (Hafen Rütgers ) is the port of Rütgers Chemicals (founded by Julius Rütgers) and is about upstream of the Port Victor on the east side of the canal after the canal makes a slight bend to the north. The main product dealt with here is pitch obtained from coal tar from the refining of coal. The port has a Pneumatic barrier. Port Luck Port Luck (Hafen Luck) belongs to the construction and building materials company Luck located on the east bank, a little more than 2 kilometres upstream of Rütgers Chemicals. Port Marmorit Port Marmorit (Hafen Marmorit) is the port of cement and lime mortar manufacturer and distributor Marmorit Knauf GmbH located north of a disused canal side channel and just north of the bridge carrying Wartburgstraße (Wartburgstreet). The actual facility consists of little more than a pier. Waltrop lock park Here after ends (or begins) the Rhine–Herne Canal, which meets the Dortmund-Ems canal (at the 14.7-kilometre mark) near the old Henrichenburg boat lift (replaced in 1962 by a newer lock, and in 1989 by a new larger lock). The terminal is used as a mooring for pleasure craft. It forms part of the Waltrop lock park. Ecosystem Fish that inhabit the canal include European eel, European carp,