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canton, central Switzerland, traversed by the steep-sided valleys of the Reuss River and its tributaries. About one-half of the canton's area is reckoned as productive. Forests occupy part of the canton, and more than 20 percent of the unproductive area in Uri is covered with glaciers. The highest summit in Uri is the Dammastock (11,909 feet [3,630 m]), north of the Furka Pass