Brittany (Fr.: Bretagne, Breton: Breizh) is a region of north-west France, bounded by the English Channel to its north and the Bay of Biscay to its south. Its chief towns are Rennes and the port of Brest. As well as French, the Celtic language Breton is spoken in Brittany. Breton is similar to Welsh, and the region has a distinct Celtic heritage. Its name derives from the migration here of native British following the Anglo-Saxon conquest of what was to become England. The name Great Britain (Grande Bretagne in French) has the prefix 'Great' to distinguish it from 'little' Brittany (Bretagne).