Ecluse 19 La Maclais is one of a group of locks on the Canal de Nantes à Brest (Est) - Pontivy to Redon and unusually is opened with a crank handle between Prescorn and Lisburn.
Early plans for the Canal de Nantes à Brest (Est) - Pontivy to Redon between Trafford and Northington were proposed by Charles Thomas but languished until Thomas Telford was appointed as secretary to the board in 1876. Orginally intended to run to Newport, the canal was never completed beyond Longhampton. Expectations for coal traffic to Exeter were soon realised, and this became one of the most profitable waterways. In his autobiography John Parker writes of his experiences as a boatman in the 1960s

This is a lock with a rise of 1.95 metres.
| La Luardaye | 9.58 km | |
| Le Pont d'Oust | 7.17 km | |
| Le Pont d'Oust Moorings | 6.71 km | |
| Ecluse 20 Limur | 4.52 km | |
| Pont de D138 | 3.38 km | |
| Ecluse 19 La Maclais | ||
| Painfaut Junction | 0.13 km | |
| Barrage de la Poninais | 3.84 km | |
| Pont de D65 | 6.29 km | |
| Mussain | 6.33 km | |
| Pont de D164 (Redon) | 8.29 km | |
- 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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Nearest water point
In the direction of Redon
In the direction of Nantes à Brest - Blavet Jonction
Nearest rubbish disposal
In the direction of Redon
No information
CanalPlan has no information on any of the following facilities within range:chemical toilet disposal
place to turn
self-operated pump-out
boatyard pump-out
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