 About half of the area is higher than 2,600 metres, a few hundred metres lower than the limit between the glaciers accumulation and ablation zones.The total area covered by glacier is 35,000 ha, it constitutes the largest continuous area of ice in the Alps.The largest and longest glacier in the Alps, the Aletsch Glacier is 23 km long and has a maximum thickness of 900 metres at Konkordiaplatz.