The Jungfrau -Aletsch protected area (officially Swiss Alps Jungfrau-Aletsch) is located in south-western Switzerland between the cantons of Bern and Valais. It is a mountainous region in the easternmost side of the Bernese Alps , containing the northern wall of Jungfrau and Eiger , and the largest glaciated area in western Eurasia, comprising the Aletsch Glacier . The Jungfrau-Aletsch protected area is the first World Natural Heritage site in the Alps; it was inscribed in 2001.

The Jungfrau-Aletsch protected area is located in the Swiss Alps between the Bernese Oberland and north-eastern Valais, about 25 km south of Interlaken and 20 km north of Brig. The site covers the whole Aar massif from the Oeschinensee in the west to the Grimselsee (not comprised) in the east, including the basins of the Aletsch, Fiescher, Aar and Grindelwald glaciers.

The culminating point is the Finsteraarhorn which, with its 4,270 metres, is also the highest mountain in the Bernese Alps.