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| | Ruhr |
 | | The Ruhr lies along, and north of, the Ruhr River (145 mi/233 km long), which rises in the hills of central Germany and flows generally west to the Rhine River at Duisburg. |
 | | Extensive coal deposits, especially the high quality coking coal required in steel manufacturing, underlie the region in basins that are near the surface along the Ruhr River (where the oldest mines and steel plants are located), and at greater depths to the north along the Lippe River (where most of the modern mines are found). |
 | | Lippe, river, Germany - Lippe, river, c.150 mi (240 km) long, rising in the Teutoburg Forest, W Germany and flowing... |
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