- A section of the water channel on a canal or river shut off above and below by lock gates provided with sluices to let the water out and in, and thus raise or lower boats from one level to another. Use more specific type where known.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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