Single Malt Scotch Whisky is world famous for its exceptional quality and variety. The title of Single Malt Scotch Whisky is protected by a law that requires the whisky to have been distilled at a single distillery in Scotland, in a copper pot still from only malted barley, yeast and water. It must then be aged in an oak cask for at least three years and a day, and be bottled at no less than 40% ABV. Scotland has over 100 Malt Distilleries which are broken down into the regions; Speyside, Highland, Island, Islay, Lowland and Campbeltown, with each region's terroir and geography having a significant effect on the character of the whisky. The flavour of whisky is created in part during the distillation process, with many variations such as the style and size of the stills at each distillery influencing the flavour produced. However all of the colour and around 60% of the final flavour comes from the oak cask the whisky is matured in with ex-bourbon and ex-sherry casks being the main choices to mature Scotch whisky.