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The English Channel
La Manche to the French — the narrow sea between Britain and France and the world's busiest shipping lane
For a thousand years this strip of water kept invasions out of England, and it has shaped the British sense of being apart from the continent ever since. The English Channel, which the French simply call La Manche, the Sleeve, is also the busiest shipping lane on Earth. More than 400 commercial vessels a day pass through the Strait of Dover at its eastern end, carrying trade to and from Rotterdam, Antwerp, Hamburg, and the Baltic, while more than 100 ferry movements a day cross it. Beneath it runs the Channel Tunnel, and on its surface small boats carry people seeking asylum, a modern drama on an ancient frontier.
The Channel stretches about 560 kilometers from the Atlantic approaches between Cornwall and Brittany to the Strait of Dover, where it meets the North Sea. It is up to about 240 kilometers wide in the west and only about 33 kilometers across between Dover's white chalk cliffs and Cap Gris-Nez, the Pas de Calais to the French. Most of it is shallow, under 120 meters, cut by the trench of Hurd Deep. The Channel Islands, British Crown dependencies, lie close to the French coast of Normandy. Ships follow traffic separation lanes monitored by British and French coastguards, northeast-bound on the French side and southwest-bound on the English side. The Channel Tunnel, 50.5 kilometers long with 37.9 kilometers under the sea, links Folkestone and Coquelles.
The Channel formed as sea levels rose at the end of the last ice age and flooded the land bridge called Doggerland, cutting Britain off from the continent some 8,000 years ago. Romans, Saxons, and Normans crossed it, the Spanish Armada failed on it in 1588, and Napoleon and Hitler both abandoned plans to cross it. In 1944 it carried the D-Day landings to Normandy. Proposals for a fixed link dated back to Napoleon's era, and the Channel Tunnel finally opened in 1994, now operated by Getlink. Since 2018 small-boat crossings by migrants have become a central issue between London and Paris, with more than 41,000 people arriving in 2025, the second-highest annual total, and many deaths at sea.