This is a list of breweries in Scotland. Beer has been produced in Scotland for approximately 5,000 years. The Celtic tradition of using bittering herbs remained in Scotland longer than the rest of Europe. Most breweries developed in the Central Lowlands, which also contained the main centres of population. Scottish brewing reached a peak of 280 breweries in 1840. The merger of breweries led to changes, the higher hop content of some of the beers allowed them to travel better than previous products thus creating a higher quality product for export. Edinburgh and Alloa in particular became noted centres for the export of beer around the world. By 1920, there were only 62 brewers left. The decline continued so that by 1960 there were only 26 and by 1970, they had dropped to just 11.