Emscher in the context of "Lippe (river)"

Oberhausen (/ˈoʊbərhaʊzən/, German: [ˈoːbɐhaʊzn̩] ) is a city on the river Emscher in the Ruhr Area, Germany, located between Duisburg and Essen (c. 13 km or 8 mi). The city hosts the International Short Film Festival Oberhausen, The Static Roots Festival and its Gasometer Oberhausen is an anchor point of the European Route of Industrial Heritage.

Essen (German pronunciation: [ˈɛsn̩] ) is the central and, after Dortmund, second-largest city of the Ruhr, the largest urban area in Germany. Its population of 574,082 makes it the fourth-largest city of North Rhine-Westphalia after Cologne, Düsseldorf and Dortmund, as well as the tenth-largest city of Germany. Essen lies in the larger Rhine-Ruhr metropolitan region, second largest by GDP in the EU, and is part of the cultural area of Rhineland. Due to its central location in the Ruhr, Essen is often regarded as the Ruhr's "secret capital".

Two rivers flow through the city: the Emscher in the north, and in the south the Ruhr River, which is dammed in Essen to form the Lake Baldeney [de] and Lake Kettwig [de] reservoirs. The central and northern boroughs of Essen historically belong to the Low German Westphalian dialects area, and the south of the city to the Low Franconian Bergish area.

Gelsenkirchen (/ˌɡɛlzənˈkɪərxən/, /ˈɡɛlzənkɪərxən/; German: [ˌɡɛlzn̩ˈkɪʁçn̩] ; Westphalian: Gelsenkiärken) is the 25th-most populous city of Germany and the 11th-most populous in the state of North Rhine-Westphalia with 262,528 (2016) inhabitants. On the Emscher River (a tributary of the Rhine), it lies at the centre of the Ruhr area, the largest urban area of Germany, of which it is the fifth-largest city after Dortmund, Essen, Duisburg and Bochum. The Ruhr is located in the Rhine-Ruhr metropolitan region, the second-biggest metropolitan region by GDP in the European Union. Gelsenkirchen is the fifth-largest city of Westphalia after Dortmund, Bochum, Bielefeld and Münster, and it is one of the southernmost cities in the Low German dialect area. The city is home to the football club Schalke 04, which is named after Gelsenkirchen-Schalke. The club's current stadium Veltins-Arena, however, is located in Gelsenkirchen-Erle [de].

Gelsenkirchen was first documented in 1150, but it remained a tiny village until the 19th century, when the Industrial Revolution led to the economic and population growth of the region. In 1840, when the mining of coal began, 6,000 inhabitants lived in Gelsenkirchen; by 1900 the population had increased to 138,000. In the early 20th century, Gelsenkirchen was the most important coalmining town in Europe. It was called the "city of a thousand fires" for the flames of mine gases flaring at night. In 1928, Gelsenkirchen was merged with the adjoining cities of Buer and Gelsenkirchen-Horst [de]. The city bore the name Gelsenkirchen-Buer, until it was renamed Gelsenkirchen in 1930. The city remained a center of coal mining and oil refining during the Nazi era, so was often a target of Allied bombing raids during World War II: nevertheless, over a third of the city's buildings date from before 1949. There are no longer coalmines in and around Gelsenkirchen; the city is searching for a new economic basis, having been afflicted for decades with one of the country's highest unemployment rates.

Bochum (/ˈboʊxʊm/, BOHKH-uum; US: /-əm/ -⁠əm; German: [ˈboːxʊm] ; Westphalian: Baukem) is a city in North Rhine-Westphalia. With a population of 372,348 (April 2023), it is the sixth-largest city (after Cologne, Düsseldorf, Dortmund, Essen and Duisburg) in North Rhine-Westphalia, the most populous German federal state, and the 16th-largest city in Germany. On the Ruhr Heights (Ruhrhöhen) hill chain, between the rivers Ruhr to the south and Emscher to the north (tributaries of the Rhine), it is the second largest city of Westphalia after Dortmund, and the fourth largest city of the Ruhr after Dortmund, Essen and Duisburg. It lies at the centre of the Ruhr, Germany's largest urban area, in the Rhine-Ruhr Metropolitan Region, the second biggest metropolitan region by GDP in the European Union, and belongs to the region of Arnsberg. There are nine institutions of higher education in the city, most notably the Ruhr University Bochum (Ruhr-Universität Bochum), one of the ten largest universities in Germany, and the Bochum University of Applied Sciences (Hochschule Bochum).

Dortmund (German: [ˈdɔʁtmʊnt] ; Westphalian: Düörpm [ˈdyːœɐ̯pm̩]; Latin: Tremonia) is the third-largest city in North Rhine-Westphalia, after Cologne and Düsseldorf, and the ninth-largest city in Germany. With a population of 614,495 inhabitants, it is the largest city (by area and population) of the Ruhr as well as the largest city of Westphalia. It lies on the Emscher and Ruhr rivers (tributaries of the Rhine) in the Rhine-Ruhr Metropolitan Region, the second biggest metropolitan region by GDP in the European Union, and is considered the administrative, commercial, and cultural centre of the eastern Ruhr. Dortmund is the second-largest city in the Low German dialect area, after Hamburg.

Founded around 882, Dortmund became an Imperial Free City. Throughout the 13th to 14th centuries, it was the "chief city" of the Rhine, Westphalia, and the Netherlands Circle of the Hanseatic League. During the Thirty Years' War, the city was destroyed and decreased in significance until the onset of industrialisation. The city then became one of Germany's most important coal, steel, and beer centres; as a consequence, it was one of the most heavily bombed cities in Germany during World War II. The devastating bombing raids of 12 March 1945 destroyed 98% of the buildings in the inner city. Involving more than 1,110 aircraft, the raids were the largest targeting a single city during World War II. Today, around 30% of the city’s buildings date from before the war.

The Rhine–Herne Canal (German: Rhein-Herne-Kanal) is a 45.6-kilometre-long (28.3 mi) transportation canal in the Ruhr area of North Rhine-Westphalia, Germany, with five canal locks. The canal was built over a period of eight years (5 April 1906 – 14 July 1914) and connects the harbour in Duisburg on the Rhine (51°26′59″N 6°46′1″E / 51.44972°N 6.76694°E / 51.44972; 6.76694) with the Dortmund-Ems Canal near Henrichenburg (51°37′1″N 7°19′19″E / 51.61694°N 7.32194°E / 51.61694; 7.32194), following the valley of the Emscher. It was widened in the 1980s. The Rhein-Herne canal ship was designed specifically for this canal; normally of about 1300–1350 ton capacity, it has a maximum draft of 2.50 metres (8.2 ft), a length of approximately 80 metres (260 ft), and maximum beam of 9.50 metres (31.2 ft).

Originally the Rhine-Herne canal ended in Herne, where it met a branch of the Dortmund-Ems-Kanal running from Henrichenburg to Herne, the intersection situated just above the East Herne lock.