The Aletsch Glacier is the largest glacier in the Alps. It has a length of about 23 km (14 mi) and covers more than 120 square kilometres (46 sq mi) in the eastern Bernese Alps in the Swiss canton of Valais. It is composed of three smaller glaciers converging at Concordia, where its thickness was near 1 km (3,300 ft). It then continues towards the Rhone valley before giving birth to the Massa River. The whole area, including other glaciers is part of the Jungfrau-Aletsch Protected Area, which was declared a UNESCO World Heritage site in 2001.
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