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Jahre Erdfallsee Grundwassermessstelle. en Groundwater measuring point in the Erdfallsee visitor area in Hopsten Kreis Steinfurt North RhineWestphalia Germany In celebrating the th anniversary of the lake's emergence in an open house was held there on April de Grundwassermessstelle auf dem Besuchergelnde am Erdfallsee im Naturschutzgebiet