Final answer:
The Ruhr River flows through Germany and joins the Rhine at Duisburg, known for the Ruhr industrial complex with coal mines and steel factories. This region has significantly contributed to Germany's economy, historically and currently, and faces environmental concerns from its industrial past.
Step-by-step explanation:
The river that flows through Germany and empties into the Rhine at Duisburg is the Ruhr River. This river is historically significant as it is associated with the Ruhr industrial complex, a region known for its coal mines and steel factories. The industrial activity along the Ruhr has been a cornerstone in the economic development of Germany.
The Ruhr area has played a pivotal role in Germany's history, particularly during the industrialization period. It is located in the western part of Germany and contains substantial coal deposits. The Ruhr's economic significance was highlighted when French and Belgian forces occupied the valley to secure reparation payments after Germany defaulted post World War I, emphasizing the region's importance in iron, coal, and steel production.
Overall, the Ruhr River is not just a waterway but also symbolizes the industrial might of Germany, contributing significantly to the nation's status as Europe's largest economy with the largest GDP overall as a country. Despite its industrial might, the region is now confronting environmental challenges due to its extensive manufacturing history.