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Siebengebirge (zē´bəngəbĬr´gə) [Ger.,=seven mountains], small wooded range of the Rhenish Slate Mts., W Germany. Of volcanic origin, it extends for c.10 mi (16 km) S of Bonn along the Rhine River and rises to 1,509 ft (460 m) in the Grosser Ölberg. One of the most scenic spots of the Rhineland, the entire range is a national park and particularly famous for the Drachenfels. It is a popular tourist region.