largest and most easterly canton of Switzerland; it has an area of 2,743 square miles (7,105 square km), of which two-thirds is classed as productive (forests covering one-fifth of the total). The entire canton is mountainous, containing peaks and glaciers of the Todi (11,857 feet [3,614 metres]), Bernina (13,284 feet), Adula, Albula, Silvretta, and Rhatikon ranges in the Central Alps. These ranges are penetrated by a system of level valleys, of which the inner ones are the highest in central Europe. The principal valleys, running southwest to northeast, are those of the Upper Rhine
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