Roquefort, sometimes spelled Rochefort in English, is a sheep milk blue cheese from the south of France, and together with Bleu d'Auvergne, Stilton and Gorgonzola is one of the world's best-known blue cheeses. Though similar cheeses are produced elsewhere, European law dictates that only those cheeses aged in the natural Combalou caves of Roquefort-sur-Soulzon may bear the name Roquefort, as it is a recognised geographical indication, or has a protected designation of origin. The cheese is white, tangy, crumbly and slightly moist, with distinctive veins of green mold.