Plettenberg, Mountain summit in Baden-Württemberg, Germany

Plettenberg is a 1,001.7-metre table mountain on the western edge of the Swabian Jura with three summit points: the main Dotternhauser Hörnle, the northern Roßwanger Hörnle (988 m) bearing a 158-metre telecommunications tower, and the southern Ratshauser Hörnle (999 m) with the Burgstall castle site. A quarry for White Jurassic limestone lies immediately beside the highest point.

Limestone quarrying on the Plettenberg began in 1908; from 1909 a wire cableway carried the rock to the Balinger Cementfabrik, which closed in 1926. Mining resumed in 1939 when the Portlandzementwerk Rudolf Rohrbach KG opened at Dotternhausen. The 158-metre telecommunications tower stands on the northern Roßwanger Hörnle.

Locals call the mountain "die Bloachta" or "die Plaikten" in the Swabian dialect. Its open plateau is kept free of trees by intensive sheep farming, and since 1908 the mountain has been quarried for limestone. A citizens' initiative now watches over the mining to protect the mountain's value as a local recreation area.

The summit plateau is reached on foot; the 2.3 km material cableway from the quarry crosses the B27 and runs to the Dotternhausen cement works, so expect industrial traffic and blasting in the quarry area. The Plettenkeller, a rock face over 100 m high, is a protected area of 37.5 hectares since 1984 and has seen rockfalls in 1851, 2010 and 2013. Keep to paths near the quarry edges.

Limestone has been extracted from the mountain for decades and transported by cable car system down to a cement factory in the valley below. This industrial operation runs alongside the recreational use of the slopes by hikers and visitors.