based on <a class="external autonumber" href="https://de.wikipedia.org/wiki/Bild:Duesseldorf_Districts.png">[1]</a>
<a href="//commons.wikimedia.org/wiki/User:Tirkon" title="User:Tirkon">Tirkon</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>