The "Rennsteig" (sometimes called "Rennweg") is an ancient path following the main ridge and connecting the summits. It is now a famous hiking path and marks the traditional boundary between the hills-dominated terrain of central Germany and the more rugged terrain characteristic of southern Germany, and also the boundary between the cultural regions of central and north Thuringia and Franconia. Dialects and traditional customs and costumes are different on either side of the Rennsteig. The Rennsteig is the subject of the song "Rennsteiglied (de)", the unofficial hymn of Thuringia.