Denghoog

Denghoog is a Neolithic passage grave dating from around 3000 BC on the northern edge of Wenningstedt-Braderup on the German island of Sylt. The name Denghoog derives from the Söl'ring Deng and Hoog .
Denghoog is an artificial hill created in the 4th millennium BC on top of a passage grave. The hill today has a height of around 3.5 metres and a diameter at the base of around 32 metres. The internal chamber is ellipsoid, measuring about 5 metres by 3 metres. Its roof is supported by twelve large boulders. The space between them is covered by dry stone walls made up of so-called Zwickelsteine. Three huge boulders, weighing around 20 metric tons each, form the roof of about 75 cm thickness. These stones are glacial erratics, carried here in the ice age from Scandinavia. The spaces between the roof stones are also filled with dry stone walling. A layer of firm blue clay, brought here from the eastern side of the island, mixed with stone fragments almost completely waterproofs the roof. Above this is a layer of yellow sand, covered by a final layer of humus.

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