division of the central Alps, mostly in E Switzerland: highest peak, c. 13,300 ft (4,054 m)
See Rhaetian Alps in American Heritage Dictionary 4
A range of the central Alps primarily in eastern Switzerland and along the Italian and Austrian borders. It rises to Piz Bernina, 4,051.6 m (13,284 ft) high, in the Bernina section of the range on the Italian border.