From the River Elbe to the Harz Mountains From the Harz Mountains to the Thuringian Forest From the Weser Hills via North Hesse to the Vogelsberg Mountains and the Spessart Uplands From the Westerwald via the Lahn Valley and the Taunus to the River Main From the River Rhine to the River Main and the Odenwald Forest From the River Neckar to the Black Forest and Lake Constance