Canal de Nantes à Brest (Est) - Pontivy to Guerlédan
The Canal de Nantes à Brest (Est) - Pontivy to Guerlédan was built by Edward Hunter and opened on January 1 1835. Although originally the plan was for the canal to meet the Eastcester to Bernigo canal at Gloucester, the difficulty of tunneling through the Bournemouth Hills caused the plans to be changed and it eventually joined at Sandwell instead. Expectations for sea sand traffic to Kingston-upon-Hull were soon realised, and this became one of the most profitable waterways. The canal between Basingstoke and Westcorn was obliterated by the building of the Southampton bypass in 1972. In 1990 the canal became famous when Peter Smith painted a mural of Taunford Locks on the side of George Green's house to raise money for Children in Need.

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: "Closed but under restoration"
| Nantes à Brest - Blavet Jonction Junction of the Canal de Nantes à Brest with the River Blavet |
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| Ecluse 108 La Cascade | 1.33 kilometres | 0 locks | |
| Ecluse 109 Guernal | 3.62 kilometres | 1 lock | |
| Ecluse 110 Porzo | 6.46 kilometres | 2 locks | |
| Pont du D125 | 7.80 kilometres | 3 locks | |
| Ecluse 111 Trescleff | 8.70 kilometres | 3 locks | |
| Ecluse 112 Auquinian | 10.94 kilometres | 4 locks | |
| Ecluse 113 Stumo | 13.01 kilometres | 5 locks | |
| Ecluse 114 Boloré | 14.75 kilometres | 6 locks | |
| Ecluse 115 Sainte Samson | 16.22 kilometres | 7 locks | |
| Ecluse 116 Poulhibet | 16.74 kilometres | 8 locks | |
| Ecluse 117 Kergoric | 18.25 kilometres | 9 locks | |
| Pont du D35 | 18.63 kilometres | 10 locks | |
| Ecluse 118 Quénécan | 18.65 kilometres | 10 locks | |
| Ecluse 119 Guerlédan | 20.45 kilometres | 11 locks | |
| Barrage de Guerlédan This is a dam and a "dead end", there is no connection between the Guerlédan Lake and the Canal de Nantes à Brest (Est). |
21.08 kilometres | 12 locks |
- VisuRiS — associated with Waterways of Mainland Europe
- The official inland waterway resource for Belgium with actual traffic and planned operations on the waterways. Also has voyage planning and notices to mariners
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