Cornwall Cornwall Cornwall (; ) is a county in South West England in the United Kingdom. The county is bordered to the north and west by the Celtic Sea, to the south by the English Channel, and to the east by the county of Devon, over the River Tamar which forms most of the border between them. Cornwall forms the westernmost part of the South West Peninsula of the island of Great Britain. The furthest southwestern point of the island is Land's End; the southernmost point is Lizard Point. Cornwall has a population of and covers an area of . The
Constitutional status of Cornwall English". On the "Mappa Mundi", circa 1300, now in Hereford Cathedral, Cornwall (as "Cornubia") is one of the very few regions within Britain to be named individually. The significance and relevance of this is unclear; the map belongs to a category of map known as Complex (Great) World Maps and its depiction, within such a world context, should be seen in parallel with related contemporaneous material. The phrase "England and Cornwall" ("Anglia et Cornubia") has been used on occasion in post-Norman official documents referring to the Duchy of Cornwall: William Caxton's 1480 "Description of Britain" debated whether or not Cornwall