The term is not precise, but typically refers to topography where the peaks rise at least 200 metres (660 ft) to 500 metres (1,600 ft) above the surrounding terrain (as opposed to above sea level). The summits usually do not reach the tree line and were not glaciated after the last glacial period. In contrast, Hochgebirge is used to refer to mountain ranges rising above approximately 1,500 metres (4,900 ft) to 1,800 metres (5,900 ft).