Does one say Je vais passer mes vacances en Cornouailles (Cornwall), dans les (le?) Cornouailles (as with dans le Kent) or is it treated as a plural, aux Cornouailles, like aux Antilles (to/in the West Indies)? According to the French section of Wikipedia, the name of this English county in French is Les Cornouailles, though apparently there is a region in Brittany (la Bretagne) also called la Cornouaille, in the singular. Cornwall is one of the three counties in the Southwest across the Bristol Channel from Wales, on the peninsula that looks like an eagle's leg. It is the last bit that ends in what resembles the claw.