Bjerrum Arch is a curved ridge that reaches 65 m above sea level. It extends from the large terminal moraine in the north (site 7 Nørlem - Nørre Nissum) for about 1.5 km to the south. From here the ridge curves towards the east. The northern part of the ridge is distinct and the south-western flank slopes steeply down towards Nørre Nissum Seminarieby. The fall is about 15 m (from 55 to 40 m above sea level) over a distance of only 200 m. Where the ridge curves to the east it becomes broader and a bit higher, but the southern flank still slopes steeply. Neither the eastern nor the north-eastern flanks are very steep, falling about 20 m over a distance of 400-500 m.