Drei-Länder-Stein
Saxony-Anhalt, Germany
The Drei-Länder-Stein is a boundary stone at the tripoint of the German federal states of Lower Saxony, Saxony-Anhalt and Thuringia near the Großer Ehrenberg mountain in the Harz.
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).