Between the main peak (, also known as the Höchste or Highest, and its subpeak, the Seebuck (), just under away, is a saddle, the Grüble, from which a wide spur, the Baldenweger Buck () branches off. The saddle initially descends gently and then ever more steeply into the valleys on either side. From the Seebuck the Feldberg drops steeply away to the northeast into the Feldsee, a lake of glacial origin at about altitude. Deeply incised valleys run northwest towards Freiburg (the Zastler and St Wilhelmer valleys) and southwest towards Basle (Wiesental valley).