Котантен
Although most of the Cotentin Peninsula belongs to the Armorican Massif, the Plain is part of the Paris Basin. Argillaceous limestone from the Sinemurian contributes to the region's dairy product appellation (AOC) Isigny-Sainte-Mère, which it shares with Bessin. Horse breeding has long been practiced in the Plain, which is regarded as the cradle of the Anglo-Norman horse breed, the product of English stallions and mares from the Cotentin Peninsula.