The stream originates in the area south of the protected Regnemarks Mose boglands and is 10 metres wide at its mouth.

A 22 km gravel road for cyclists and pedestrians follows the stream from the town of Køge to Humleore on onwards to Borup station.

[1] Køge Å is home to the endangered Spined loach (Cobitis taenia).

It was designed by Hans van Steenwinckel the Younger but has been widened several times.

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