Bernina bĕrnē´nä [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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