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Canals are man-made waterways constructed to allow the passage of boats or ships inland or to convey water for irrigation.
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Locks: A device used for raising and lowering boats between stretches of water of different levels on river and canal waterways.
Aqueducts: An artificial channel for conveying water, typically in the form of a bridge across a valley or other gap.
Irrigation: The supply of water to land or crops to help growth, typically by means of channels.