That photo looks like the Polish-German border. What gives?
I have seen a picture and a map of the event. The Polish people made a human prayer chain which completely surrounded Poland, i.e. a circle. I think it included along the Baltic coast as well.
The Polish people have been the most faithful Christians in Europe. A few centuries ago, their army led by Jan Sobieski defeated the Ottoman army just outside the gates of Vienna.
This explains the origin of ‘stupid Polak” jokes which were actually begun by anti-Christian ‘intellectuals’.