<a href="https://en.wikipedia.org/wiki/Boundary_marker" class="extiw" title="w:Boundary marker">Boundary marker</a> and information board <a href="https://en.wikipedia.org/wiki/Dreieckiger_Pfahl" class="extiw" title="w:Dreieckiger Pfahl">Dreieckiger Pfahl ("Triangular Post")</a> in the <a href="https://en.wikipedia.org/wiki/Harz_National_Park" class="extiw" title="w:Harz National Park">Harz National Park</a>
<a href="//commons.wikimedia.org/wiki/User:WtribbleCommonS" title="User:WtribbleCommonS">Torben T. Koch</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>