Pool and nature reserve "Ahlder Pool" near Schüttorf, district Emsland, south-western Lower Saxony, Germany.
<a href="//commons.wikimedia.org/wiki/User:Fice" title="User:Fice">Christian Fischer</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span> (digital copy of a slide).