This indicates that the whisky was made in only one distillery and has not been blended with any other product from elsewhere. It may however contain whisky from several production batches over a period of up to a couple of years. There are rather fewer than 100 working malt whisky distilleries in Scotland with the dominant concentration in the Spey valley in north-east Scotland around Elgin. A smaller group of particularly characterful malt distilleries exists on the western island of Islay and there used to be a third group centred round Campbeltown. About 120 single malts can be identified including the bottled product of now-defunct distilleries.