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Wikipedia has a page about Royal Canal
The Royal Canal (Irish: An Chanáil Ríoga) is a canal originally built for freight and passenger transportation from the River Liffey in Dublin to Longford in Ireland. The canal fell into disrepair in the late 20th century, but much of the canal has since been restored for navigation. The length of the canal to the River Shannon was reopened on 1 October 2010, but the final spur branch of the canal to Longford Town remains closed.