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The Seven Seas
Some oceans are separated by a narrow piece of land. In the old days, you could almost sail from the Mediterranean to the Red Sea except for a little piece of Egypt that was in the way. So you would have to sail all the way around Africa.
In 1869, after ten years of work, the Suez Canal was opened. Now you can sail between the two seas in a jiffy!
There are several other ship canals around the world, such as the Panama Canal, which links the Atlantic Ocean to the Pacific.