Sewage treatment plant in <a href="//commons.wikimedia.org/wiki/Gobabis" class="mw-redirect" title="Gobabis">Gobabis</a>, <a href="//commons.wikimedia.org/wiki/Namibia" title="Namibia">Namibia</a> (2018)
<a href="//commons.wikimedia.org/wiki/User:Hp.Baumeler" title="User:Hp.Baumeler">Hp.Baumeler</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>