The narrowest part of the English Channel is known as the Strait of Dover. This strait separates the southeastern coast of England from the northern coast of France. At its narrowest point, the Strait of Dover is approximately 21 miles (34 kilometers) wide. This part of the channel is historically and strategically significant, serving as a crucial maritime route between the North Sea and the Atlantic Ocean. The strait has been a focal point for trade, military, and cultural exchanges for centuries. The town of Dover in England and the city of Calais in France are the primary locations on either side of the strait. The Strait of Dover is also notable for the Channel Tunnel, an underwater rail tunnel that connects the UK with mainland Europe.