The Siebengebirge , occasionally Sieben Mountains, are a hill range of the German Central Uplands on the east bank of the Middle Rhine, southeast of Bonn.
The area, located in the municipalities of Bad Honnef and Königswinter, consists of more than 40 hills. The hills are of ancient volcanic origin and came into being between 28 and 15 million years ago. Much of the territory covered by Sieben Hills belongs to the Sieben Hills Nature Park , which is under environmental protection.
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