The body of water that separates the United Kingdom from mainland Europe is the English Channel. This narrow body of water lies between southern England and northern France, approximately 21 miles at its narrowest point, known as the Strait of Dover. The English Channel has significant historical and economic importance, serving as a vital waterway for trade and transportation. It is also famous for its ferry services, which connect the UK with continental Europe. The channel's rich maritime history includes naval battles and migrations, making it a notable geographic feature in European history.