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A blue line. It will also be annotated (in blue) "canal" or given a name eg. Shropshire Union Canal.
Salem S. Milad has written:
'A study of the invertebrate fauna and crustacean zooplankton of the Shropshire Union Canal and the Llangollen Canal'
Grand Union Canal Carrying Company was created in 1934.
Grand Union Canal Carrying Company ended in 1948.
the longest canal in the UK is the Grand Union Canal 137 miles from London to Birmingham