OSM tag name=Illmensee matches Illmensee in these Wikidata fields:
OSM tag name=Illmensee matches Illmensee (Lake) in these Wikidata fields:
OSM tag name=Illmensee matches Illmensee (lake) in these Wikidata fields:
Lakes of Baden-Württemberg | water=pond, water=lake, natural=lake |