Stilton:
An English blue cheese made from whole cow's milk. The milk ripens for four to six months, allowing mold to grow. It is a cheese with a pale yellow-white color and blue-green veins. It is creamy and rich in texture and its flavor sharpens with age. It has a mellow flavor with a pungent blue-cheese bite. Stilton can only be made in the British counties of Nottinghamshire, Derbyshire, and Leicestershire to a specified recipe.

Source