The last 30 miles or so of the Spey valley and its tributaries holds by far the greatest concentration of distilleries in Scotland - currently 40 or so operating distilleries. Other smaller concentrations can be found on the island of Islay and though there are only one or two distilleries left there now, Campbeltown used to be a major distilling area.
The Spey is fastest flowing river in Britain and can rise 12 feet during the snow melt.