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Photo: Dirk Ingo Franke, CC BY-SA 2.0 de via Wikimedia Commons
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Eidersperrwerk
Germany's largest coast protection structure is intended to protect the area from storm surges. While not as impressive as similar structures in the Netherlands, it makes for a nice bike trip. It was built in 1973 as a response to the 1962 Hamburg flood that wreaked havoc in Hamburg as in Tönning as the rivers had until then been mostly ignored in coast protection and dike efforts.