Trough for compensation of high water levels of Alster river in landscape conservation area „Hummelsbütteler Feldmark/Alstertal“, Hamburg district <a href="https://de.wikipedia.org/wiki/Hamburg-Poppenb%C3%BCttel" class="extiw" title="de:Hamburg-Poppenbüttel">Poppenbüttel</a>.
<a href="//commons.wikimedia.org/wiki/User:Vitavia" title="User:Vitavia">Vitavia</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>