Hagener Au

Hagener Au
Hagener Au and Auwiesen close to the mouth near the Baltic Sea
Location	Plön, Schleswig-Holstein,  Germany
Reference no.	DE: 965529
Basin features
Main source	Source: Passader See 54°20′26″N 10°18′19″E / 54.34046°N 10.30533°E / 54.34046; 10.30533Coordinates: 54°20′26″N 10°18′19″E / 54.34046°N 10.30533°E / 54.34046; 10.30533
River mouth	Kiel Fjord between Laboe and Stein 54°24′59″N 10°14′32″E / 54.4163°N 10.2421°E / 54.4163; 10.2421
River system	Hagener Au
Landmarks	Villages: Probsteierhagen, Lutterbek, Stein
Physical characteristics
Length	10 km

The Hagener Au is a roughly 10 kilometres (6.2 mi) long stream 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.

Sections of the Hagener Au are very natural and surrounded by wetlands. In addition the stream is a habitat for the rare Spined loach. The stream has been straightened near its mouth and the last 50 metres (160 ft) runs through a pipe. Together with the Passader See the Hagener Au is a protected Special Area of Conservation.