The massif rises quite slowly from lake Bygdin, and ends in an extremely steep wall to the north.

The massif contains ten 2,000-metre (6,600 ft) summits, but the northwesternmost (in the foreground on the photo to the right) and the two easternmost (not visible) are normally seen as independent mountains.

The prominence of most of the summits are less than 100 metres (330 ft), and most of the massif is a broad ridge or a plateau which makes it very popular among mountain skiers.

The southern slopes and the plateaus consist mostly of talus, and there is very little plant life except lichen, moss and ranunculus glacialis.

Snow sparrows and mountain grouses are frequent and reindeers can be seen, but they mostly prefer the grassy slopes down towards lake Bygdin.

The Eastern Kalvehøgde and the Mugna summit were both climbed in 1820 by the two students Balthazar Mathias Keilhau and Peter Christian Bianco Boeck, both later prominent scientists at the university of Christiania.