Bussen, Mountain summit in Biberach district, Germany.

The Bussen is a 766.7-metre mountain in the Biberach district of Baden-Württemberg, rising between the Federsee and Riedlingen above the village of Offingen. An eight-metre layer of Sylvanakalk limestone armours its summit, where the pilgrimage church of St John the Baptist stands beside the keep of the ruined Hinterburg, now used as a viewing tower.

A church on the summit was first documented in 805, when it was transferred to the monastery of St. Gallen. In the 13th century a Hohenstaufen imperial castle stood here; after the dynasty's fall it passed to the Counts of Veringen, then to the Habsburgs, who mortgaged it to the Truchsess of Waldburg in 1387. Swedish troops destroyed the castle in 1633. The keep of the rear castle survives as a lookout tower.

The pilgrimage church at the summit draws visitors who come to experience its religious importance and to enjoy the view from high above. The site remains part of local spiritual life and continues to attract people from the surrounding region.

Several walking routes surround the mountain and offer paths for different fitness levels, from leisurely strolls to more challenging hikes. The best starting point is the village below, and you should wear sturdy shoes and bring water.

The summit's limestone cap, up to 8 metres thick, resisted the ice-age glaciers, so the Bussen kept its height while surrounding land was worn down. From the top, the Ulm Münster and the Alpine chain from the Bavarian pre-Alps to the Bernese Alps can be seen in clear weather.