Rötteln Castle (German: Burg Rötteln), located above the Lörrach suburb of Haagen, lies in the extreme southwest corner of the German state of Baden-Württemberg, just 10 kilometres (6 miles) north-east of the Swiss City of Basel. The fortification was one of the most powerful in the southwest, and today, it is the third largest castle ruin in Baden.
The castle remains are located on a prominent wooded hill 422 metres (1,385 feet) above sea level. The keep lies on a spur projecting from the steep-sided east side of the lower Wiese valley.
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