The White Main Spring is the source of the White Main river, the right-hand and northern headstream of the River Main, a major tributary of the Rhine in Germany. It is located at a height of 887 metres above sea level on the eastern slopes of the Ochsenkopf mountain and is viewed as the source of the Main, even though the Red Main is several kilometres longer. Usually the White Main Spring is stronger than the Red Main Spring.
Margrave Frederick of Brandenburg had it traced in 1717 and impounded in granite blocks bearing the Hohenzollern coat of arms. The spring bears the name Fürstenbrunnen, but is not to be confused with the Upper and Lower Fürstenbrunnen on the Ochsenkopf.
Wikipedia https://en.wikipedia.org/wiki/White_Main_Spring
Address (Unnamed Road), 95686, Germany
Coordinates 50°1'47.518" N 11°49'25.215" E