Lowland whiskies are generally regarded as the most light bodied of the Single Malts. Auchentoshan and Glenkinchie are two examples.
Islay whiskies are generally described heavily peated, oily and even iodine-like and medicinal. Islay is an island off the coast of Scotland proper, and a number of marine characteristics can carry into the whiskies produced here. Ardbeg, Laphroaig and Lagavullin are all Islay whiskies.
Highland whiskies include Oban, Glenmorangie and the Dalmore. Not as light as Lowland whiskies, but lighter and more elegant than the bullies from Islay.
The Islands comprise all of the whisky producing islands in Scotland minus Islay, and are generally considered part of the Highland district. However, with unique offerings from Talisker, Jura and Arran, some argue that it deserves consideration as its own region.
Speyside offers up the most distilleries of any region in Scotland. Considered the most elegant whiskies in Scotland, Speyside is home to the Macallan, Glenlivet, and Glenfiddich.
Campbeltown is home to Springbank, makers of Springbank, Hazelburn and Longrow and Glen Scotia. Springbank is the iconic Campbeltown whisky, usually found at 10 years of age although other bottlings exist.