Cornwall is located in the south-west of England, forming the most south-westerly point of mainland Great Britain.

Here's a more detailed description:

* It's a peninsula that juts out into the Atlantic Ocean, bordered by the English Channel to the north.

* It's separated from Devon by the River Tamar.

* Major cities in Cornwall include Truro, Penzance, and Newquay.

You can easily find Cornwall on any map of England.