Spey (spā) [key], river, c.105 mi (170 km) long, rising in the Mondhliath Mts., NE Scotland, and flowing generally NE through the Moray Firth to the North Sea. The river is rapid and unnavigable. There are important salmon fisheries on the lower Spey. Water from the river is used in the manufacture of many of the famous Speyside whiskies.
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