Northeim Lake District
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It has its origin in gravel extraction by open-pit mining. Digging for gravel began in 1852 in order to build the Royal Hanoverian State Railways. After World War II mining was intensified. Gravel that is found there is composed of greywacke, radiolarite and sand.
It is now a recreation area. Persons can use the lakes for swimming, diving or windsurfing. It is also a good site for persons with sailboats.