Kent is a county in England. It is just to the south-east of London and is on the coast. The sea to the East of Kent is the North Sea. The sea south of Kent is called the English Channel by the British. France is opposite Kent on the other side of The Channel. At the most narrow point, between Dover, Calais and Cape Gris-Nez, The Channel is only 21 miles (34 km) wide. Dover is one of the main ports in Kent. From here many ferries sail to and from France.