Cognac is produced in the surrounding wine-growing region of France. Its production falls under the French "appellation d'origine contrôlée", with production methods and appellation required to meet certain legal requirements. This drink must be twice distilled in copper stills and aged for at least two years in French oak barrels from Limousin or Tronçais. Cognac is matured in the same way as whiskies and wines are aged in barrels, and most Cognacs spend much longer "in wood" than the minimum required by law.