In the social history of England, the English Channel, that proud sea passage some three hundred and fifty miles long, has separated that country from the Continent as by a great gulf or a bottomless chasm.

However, at its narrowest point, between Dover and Cap Gris-Nez—a distance of some twenty-one and a half miles—the Channel, despite any impression that storm-tossed sea travelers across it may have of yawning profundities below, is actually a body of water shaped less like a marine chasm than like an extremely shallow puddle. Indeed, the relationship of depth to breadth across the Strait of Dover is quite extraordinary, being as one to five hundred. This relationship can perhaps be most graphically illustrated by drawing a section profile of the Channel to scale.

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