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Canal
Canals are man-made waterways, usually connecting existing lakes, rivers, or oceans.
They are used for transportation, often by barge or narrowboat on smaller canals, and by ship on canals that connect oceans.
Inland canals preceded the development of railroads during the Industrial Revolution, and some canals were later drained and used as railroad rights-of-way.
Irrigation canals - man-made waterways for the delivery of water - preceded the use of transportation canals.
Canals have found another use in the 21st century, as wayleaves[?] for fibre optic telecommunications networks.
For a time in the early 20th century, it was believed that there were canals on Mars. This belief was due to a combination of errors: an optical illusion caused the astronomer Giovanni Schiaparelli to think he saw channels on the planet's surface, and the Italian word for channels, "canali", was misunderstood by English-speakers.
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