By the stream
3 places in Cologne
Butzbach
A roughly 5.8 km sandy stream that rises in the Wahner Heide and seeps away in the Grengel Bieselwald – part of a protected landscape area in southern Cologne.
Frechener Bach
A small stream that begins at the Frechen sewage works and, after 4.6 km, seeps away in Cologne's green belt near the Militärring – restored on Cologne territory.


