and repair work are organised and performed. Oberhausen marina The Oberhausen marina is a yacht port opened in 2004 in close proximity to the CentrO shopping centre. The port has a water depth of and over 13 bridges. Also at the Oberhausen marina are the attractions Sealife Oberhausen and Oberhausen Modellbahn World. City port of Essen The Stadthafen Essen (City port of Essen) is the youngest port on the Rhine–Herne Canal opened in 1934 by the city of Essen, and operated since 1987 by Stadtwerke Essen. The port consists of a doubled sided canal side quay together with a harbour port at right angles onto the canal, which together form a water area of with associated dock-land of The dock handles bulk goods such as solid mineral fuels, petroleum and chemical products, stone, earth and iron and steel as well as recyclable materials, and is an important transhipment point. City port of Gelsenkirchen The port of the city of Gelsenkirchen (Stadthafen Gelsenkirchen) was opened in July 1914 and is the oldest port on the Rhine–Herne Canal. The port has two docks branched from the canal situated just east of the lock at Gelsenkirchen and has a water surface of . The industrial port is ~ and the trading port ~. A private railway of length is operated which is linked to the tracks of the Deutsche Bahn Formerly the port dealt mainly with coal and mining products, now the port is a major hub for petroleum products and second-largest inland port for cereals in North Rhine-Westphalia. It is operated by the Gelsenkirchener Logistik-, Hafen- und Servicegesellschaft (Gelsenkirchener logistics, harbour and service company.) a subsidiary of Stadtwerke Gelsenkirchen. Port Grimberg Hafen Grimberg (Port Grimberg) is on the south canal bank in Gelsenkirchen, near the city boundary to Herne. It was named after the nearby Castle Grimberg, of which today only the foundations remain. Built in 1914 by the Gelsenkirchener Bergwerks AG (GBAG) to provide a link to the GBAG mines of Rheinelbe, Alma and Pluto as well as supplying the ironworks of 'Schalker group' with imported ore. Around the same time, and up to 1929 the industrial railway of Erzbahn was built, serving the Schalker and Bochum group iron and steelworks. Between 1937 and 1968 Grimberg harbour was one of the major ports on the canal. In 1968 steel production at the southern end of the Erzbahn at Bochum ended, in