Petersgrat, Alpine summit in Bernese Alps, Switzerland

The Petersgrat is a broad, almost entirely ice-covered ridge in the Bernese Alps on the border between the cantons of Bern and Valais, reaching 3,206 m on a rock rib in its eastern part that descends from the Tschingelhorn. The western ice dome lies at 3,192 to 3,195 m and varies with ice thickness. Its northern slopes feed the Kanderfirn, while the Tellingletscher drains south into the Lötschental.

The ridge lies on the border between the cantons of Bern and Valais and forms part of the European watershed: meltwater from the Kanderfirn on the north side drains via the Aare and Rhine to the North Sea, while ice and water on the south side flow through the Tellingletscher and Üsser Talgletscher into the Lötschental and via the Lonza and Rhone to the Mediterranean. Its highest point, 3,206 m, is a rock rib on the eastern part that descends from the Tschingelhorn; the broad ice-covered dome to the west reaches 3,192 to 3,195 m and varies with ice thickness. The normal routes to the Tschingelhorn and the Lauterbrunnen-Breithorn run over the ridge.

The ridge lies on the cantonal border between Bern and Valais, and the two sides are reached from different valleys: the Kanderfirn and Mutthornhütte lie to the north, the Lötschental with its Tellingletscher and Üsser Talgletscher to the south. The normal routes to the Tschingelhorn and the Lauterbrunnen-Breithorn cross the ridge.

The easiest approach starts at the Mutthornhütte north of the ridge, reached on a T4/L route; an ascent from the Lötschental to the south is also possible. The normal routes to the Tschingelhorn and the Lauterbrunnen-Breithorn cross the Petersgrat. The ridge is a designated mountain landing site used for heliskiing and snow landings.

The highest point, 3,206 m, lies on a rock rib in the eastern part of the ridge, while the broad ice-covered dome to the west reaches only 3,192 to 3,195 m and changes height as the ice thickness varies from year to year. The ridge is also designated as a mountain landing site and is used for heliskiing.