A canal tunnel is a tunnel for a canal. The biggest canal tunnel in the world is the Rove Tunnel in France. The oldest canal tunnel in the world is the Malpas Tunnel also in France, built in 1679. In the United States there is the Paw Paw Tunnel that opened in 1850.
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.
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