Hohenbol, Mountain summit in Baden-Württemberg, Germany.

The Hohenbol is a 602.2 m high mountain near Owen in the Esslingen district, a foothill of the Teckberg northwest of the Swabian Jura escarpment. It is a volcanic witness mountain, one of 355 volcanoes in the Urach-Kirchheim volcanic area. A group of black pines planted in 1916 stands on its summit, giving it the nickname "Zahnbürstle".

The mountain represents a volcanic remnant from the Miocene epoch, formed when ancient volcanic vents erupted in this region approximately 15 million years ago, creating one of 355 known volcanic structures in the Urach volcanic field.

The summit's cluster of black pines, planted in 1916 as a trial group of 50 seedlings of unknown origin, stands out against the sparse vegetation and gives the Hohenbol its nickname "Zahnbürstle" (little toothbrush). The thin, nutrient-poor humus over the rock dries out quickly on the exposed summit, which is why little else grows there.

The Hohenbol lies about 2 km from Owen in the Esslingen district, northwest of the Teckberg. The summit and the Teckberg are a protected nature reserve, so stay on existing paths. The thin, nutrient-poor humus over the rock dries out quickly in wind and sun, leaving little cover.

The summit pines are not natural: a test group of 50 black pines was planted in 1916 because the thin, nutrient-poor humus over the rock dries out quickly on the exposed summit. The origin of the seedlings is unknown, and the group stands out against the otherwise sparse vegetation, earning the mountain the nickname "Zahnbürstle".