Großer Knollen, Mountain summit in Lower Saxony, Germany

Großer Knollen reaches 687 meters (2,254 feet) in elevation and is surrounded by extensive beech forests on lower slopes and spruce forests at higher elevations. The summit and surrounding slopes are crossed by several marked hiking trails that connect to neighboring towns including Bad Lauterberg, Herzberg, Scharzfeld, and Sankt Andreasberg.

The 20-metre Knollenturm observation tower was built on the summit in 1904, together with the Knollenbaude inn beside it. The tower is made of stone and topped by a cap carrying a flagpole. From it the view reaches south to the Rotenberg and Eichsfeld, and in clear weather as far as the Großer Inselsberg in the Thuringian Forest.

The summit inn, the Knollenbaude, stands beside the 20 m Knollenturm tower built in 1904. The mountain's name appears in records as Grosze Knolle, and the Harzer Wandernadel treats the summit as checkpoint no. 150, so walkers carry a stamp booklet and mark their visit at the top.

The mountain is most accessible during warmer months when trails are dry and easier to walk on. Sturdy footwear is recommended since the routes pass through forested terrain with some steep sections.

About 800 metres east of the summit lies the Knollengrube, a pit where iron ore was mined until 1925. The mountain itself is a porphyry volcano, and reddish porphyry shows in the rock beside the path on the climb.