A canal basin is (particularly in the United Kingdom) an expanse of waterway alongside or at the end of a canal, and wider than the canal, constructed to allow boats to moor or unload cargo without impeding the progress of other traffic, and to allow room for turning, thus serving as a winding hole. For inland waterways, a basin may be thought of as a land-locked harbour.^[1]

A basin was often associated with wharves around its perimeter, to support commercial users. In modern times, canal basins are more usually used to moor residential and recreational narrowboats.

• A canal basin at Williamsport, MD on the Chesapeake and Ohio Canal
• Cushwa basin, a modern look at the canal basin in Williamsport.
• Port Delaware on the Morris Canal, with boats waiting for cargo.

• List of canal basins in the United Kingdom
• Turning basin