Mecinus heydeni

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The Bullengraben is a ditch in Berlin's glacial valley, which has been in use since the 7th century. It is located in the Berlin district of Spandau and runs from the old village center of Staaken eastwards for about five kilometers to the Havel River, into which it flows north of the Spandau castle rampart. Used for centuries to improve the wetlands, since the 1960s it has been used as a drainage ditch to collect rainwater from the surrounding neighborhoods of Spandau.

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