A canaltunnel is a tunnel for a canal. The building of a canaltunnel is crucial to help a waterway that is normally used for shipping cross a difficult section of terrain. They are also constructed to reduce the dependency on canal locks.
The longest canaltunnel in the world is the Rove Tunnel in France, currently disused. Other notable examples of canal tunnels include the proposed Stad Ship Tunnel in Norway, a proposed tunnel for sea going vessels, Standedge Tunnel, the longest, deepest and highest in the United Kingdom and Harecastle Tunnel, another noteworthy tunnel in the UK.
In some canal tunnels the towpath continues through the tunnel. In other cases, especially on English narrow canals, there is no towpath. The horse would be led over the hill and the boat would be propelled by legging.
The term "canaltunnel" is not commonly applied to tunnels used to conduct water (for irrigation, water supply, etc.), such as the 48-kilometre-long Arpa-Sevan tunnel in Armenia (see List of longest tunnels), or a number of tunnels on the Irtysh–Karamay–Ürümqi Canal in China. For those, the term watertunnel is more commonly used.
Canal tunnels were made in the Kingdom of Travancore as early as 1876.
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