The Swiss Alps straddle the central sector of the European Alps and with 48 peaks over 4000m (13120ft) they have more high peaks than any other country in Europe. The valleys of the Swiss Alps are characteristically U-shaped and its glaciers have retreated and remain only in high mountain areas. Today, the Aletsch Glacier in the Bernese Alps is the largest and longest in the Alps, having a length of 23km and a maximum depth of 900m (2953ft) at Konkordia.