The Troldborg Ring is an Iron Age fortification in Vejle Municipality in Denmark, 13 km west of the city of Vejle. It is located at a natural spring on a high point overlooking the Vejle River Valley. The surrounding area is a steep ravine known as the Devil's Valley. The site consists of a raised area of about 1,700 m2 surrounded by a circular rampart.
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Coordinates 55°40'43.753" N 9°20'33.348" E