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The Hagener Au (German pronunciation: [ˈhaːɡənɐ ˈaʊ̯]) is a stream, roughly 10 kilometres (6.2 mi) long, in the district of Plön in the north German state of Schleswig-Holstein. It is an outlet of the Passader See. From the lake's southwestern bay the stream flows in a northerly direction and discharges between Laboe and Stein in the Baltic Sea.