Runder Berg, Mountain summit and castle ruins in Bad Urach, Germany.

Runder Berg is a forested summit in Bad Urach, in the Swabian Alb region of southwestern Germany, with the remains of a medieval castle on top. The summit has an oval plateau surrounded by trees, and from its edges you can look out over the town and the valley below.

The oldest finds on the plateau date to around 1600 BC, with a second settlement phase from about 1100 to 750 BC. After a 200-year gap, the hill was resettled around 550 BC and destroyed around 400 BC. Soon after the Roman limes fell, an Alemannic petty king settled here in the 4th and 5th centuries, protected by a 220-metre wood-and-earth wall. The site was abandoned for good in the first half of the 11th century.

The name Runder Berg means Round Mountain, referring to the oval hill seen from Bad Urach. Excavations from 1967 to 1984 uncovered workshops of goldsmiths, bronzesmiths and bone carvers who worked for an Alemannic petty king in the 4th and 5th centuries.

The summit is reached on foot from Bad Urach; the climb gains about 250 m from the valley. The plateau covers roughly 0.45 ha and connects to the Alb plateau only by a narrow saddle, so the paths converge there. Excavated areas and wall lines lie on the plateau and on a terrace on the slope.

The hill has a nearly perfect circular outline when seen from the valley, something rare among the summits of the Swabian Alb. This shape came about through natural geological processes, not human intervention.