Slag heap at <a href="https://en.wikipedia.org/wiki/Steinhuder_Meer" class="extiw" title="en:Steinhuder Meer">Lake Steinhude</a>
<a href="//commons.wikimedia.org/wiki/User:Hydro" title="User:Hydro">Hydro</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>