We find this arch near the village of Dahn in Rhineland-Palatinate.
Park at Building 57A on Beim Bubenrech Street and head north up the forest path for about 1.1 km.
Then turn right. You reach the arch after another 100 m.
It's dimensions: Span: 4,0 m; Heigt: 1,9 m.
UTM Coordinates: 32U 511348 5343739