French wine is produced throughout France, totaling between 50 and 60 million hectolitres per year. France has a long history of winemaking dating back to the 6th century BC. French wines range from expensive, high-end wines sold internationally to more modest wines usually only seen within France. Two important concepts in higher-end French wines are terroir, which links wine style to its location, and the Appellation d'origine contrôlée system which defines approved grape varieties and practices in different appellations. France is also the source of grape varieties and winemaking styles that have spread worldwide.