Harecastle Tunnel is a canal tunnel on the Trent and Mersey Canal in Staffordshire between Kidsgrove and Tunstall. The tunnel, which is 1.6 mi (2.6 km) long, was once one of the longest in the country. Its industrial purpose was for the transport of coal to the kilns in the Staffordshire Potteries. The canal runs under the 195 m (640 ft) Harecastle Hill near Goldenhill, the highest district in Stoke-on-Trent.