The Swansea Canal is a narrow canal and is part of the Waterways of Mainland Britain. It runs for 5 miles and 3¾ furlongs through 4 locks from Hebron Road Terminus (which is a dead end) to Cilmaengwyn Terminus (which is a dead end).
The exact dimensions of the largest boat that can travel on the waterway are not known. The maximum headroom is not known. The maximum draught is not known.
This waterway is excluded by default from route planning with the following explanation: "under restoration"
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|Hebron Road Terminus|
|Lower Clydach Aqueduct||½ furlongs||0 locks|
|Pont John Bridge No 1||1 furlong||0 locks|
|Pont Nant Lowrog Bridge No 2||4 furlongs||0 locks|
|Clydach Lock No 6||4 furlongs||0 locks|
|Coed Gwyllym Bridge No 3||7¼ furlongs||1 lock|
|Lower Trebanos Lock No 8||1 mile and 7 furlongs||1 lock|
|Trebanos Bridge No 4||1 mile and 7 furlongs||2 locks|
|Upper Trebanos Lock No 9||1 mile and 7 furlongs||2 locks|
|Upper Clydach Aqueduct||2 miles and 7 furlongs||3 locks|
|Herbert Street Bridge No 5||2 miles and 7¼ furlongs||3 locks|
|Arthur Terrace Bridge No 6||3 miles and 1 furlong||3 locks|
|Ynysmeudwy Bridge No 7||3 miles and 4 furlongs||3 locks|
|Ynysmeudwy Bridge No 8||3 miles and 7¼ furlongs||3 locks|
|Ynysmeudwy Lock||4 miles and 3 furlongs||3 locks|
|Ynysmeudwy Bridge No 9||4 miles and 4¾ furlongs||4 locks|
|Cwmdu Aqueduct||4 miles and 5 furlongs||4 locks|
|Ynysmeudwy Bridge No 10||4 miles and 5¼ furlongs||4 locks|
|Cilmaengwyn Terminus||5 miles and 3¾ furlongs||4 locks|
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Wikipedia has a page about Swansea Canal
The Swansea Canal (Welsh: Camlas Abertawe) was a canal constructed by the Swansea Canal Navigation Company between 1794 and 1798, running for 16.5 miles (26.6 km) from Swansea to Hen Neuadd, Abercraf in South Wales. It was steeply graded, and 36 locks were needed to enable it to rise 373 feet (114 m) over its length. The main cargos were coal, iron and steel, and the enterprise was profitable.
Sold to the Great Western Railway in 1873, it continued to make a profit until 1895. A period of decline followed, with the last commercial traffic using the waterway in 1931. Subsequently, parts of it were closed and filled in under a succession of owners, but around 5 miles (8.0 km) remain in water. The Swansea Canal Society, formed in 1981, is actively involved in plans for its restoration.