Bernina (bĕrnēˈnä) [key], mountain group, part of the Rhaetian Alps on the Swiss-Italian border, SE Switzerland. Piz Bernina is the highest (13,304 ft/4,055 m) peak. The group has many glaciers; Morteratsch Glacier is the largest. The Bernina Pass, 7,645 ft (2,330 m) high, from the Upper Engadine Valley, Switzerland, to the Valtellina, Italy, is crossed by a road (built 1842–65) and a railroad (built 1907–10).
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