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
Geography of Cornwall are in the USDA Hardiness zone 10, is the only area in the UK that is in this zone. However, compared to most other climates in zone 10, Scilly has cool summers. In Scilly there is on average less than 1 day of air temperature exceeding 30 °C per year and it is in the AHS Heat Zone 1. Pendennis Point in Falmouth is the warmest place on mainland Great Britain, with an average temperature of 11.4 °C (52.5 °F). Extreme temperatures in Cornwall are particularly rare, however extreme weather in the form of storms and floods is common. The