At the heart of the Rhön, albeit only the fourth highest summit of these mountains, is the Heidelstein () on the border between Bavaria and Hesse on the Rhine-Weser watershed. It forms the main high point on the plateau of the Long Rhön, which runs northeast over the Stirnberg () as far as the Ellenbogen (Schnitzersberg) () without crossing any significant lower ground. Within the Long Rhön the basalt layer is almost unbroken.