"Der Rennweg der Haßberge" is a historic, approximately 60-kilometer-long route originally used by express messengers and couriers; today, it serves as a varied trail for hiking and gravel biking. It runs exclusively along the wooded ridgelines of the Haßberge Nature Park between Sulzfeld and Hallstadt, deliberately bypassing the surrounding villages
https://www.wanderbares-deutschland.de/wege/alle-wege/rennweg-der-hassberge-7ca50b2ff0