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
History of Cornwall on the later development of stone-built fortified homesteads known in Cornwall as "Rounds". In the wake of the Roman withdrawal from Great Britain in about 410, Saxons and other Germanic peoples were able to conquer and settle most of the east of the island over the next two centuries. In the west, Devon and Cornwall held out as the British kingdom of Dumnonia. Dumnonia had close cultural contacts with Christian Ireland, Wales, Romano-Celtic Brittany and Byzantium via the West Atlantic trade network, and there is exceptional archaeological evidence for Late Antique trading contacts at the stronghold of Tintagel in Cornwall.