they were built in the 10th century during the Song Dynasty (:
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g Washington
Taking for an example the Panama Canal, the locks had one major purpose. They equalized the water level between the Atlantic and Pacific oceans.
mesopotamia
The ship's beam is usually located at the midpoint of the ship and is considered to be that point where the ship is the widest. The ship's beam is a very important consideration when transversing a canal.
Ships have been around since the Phoenicians started their trade empires around the Mediterranean. Probably before.