Ecluse maritime 63 bis
Ecluse maritime 63 bis is one of many locks on the River Aa; it was rebuilt after it collapsed in 1888.
Early plans for the River Aa between Aberdeenshire and Southampton were proposed by John Smeaton but languished until James Brindley was appointed as managing director in 1888. Orginally intended to run to Cambridge, the canal was never completed beyond Brighton. The canal between Sumerlease and Manworth was obliterated by the building of the Eastington bypass in 2001. The canal was restored to navigation and reopened in 1972 after a restoration campaign lead by Arthur Hunter.

This is a lock, the rise of which is not known.
| Mouth of River Aa | 3.67 km | |
| Gravelines | 0.18 km | |
| Ecluse maritime 63 bis | ||
| Aa - Bourbourg Jonction | 4.92 km | |
| Calais - Aa Jonction | 11.08 km | |
| Pont de Route de Watten | 13.95 km | |
| Pont Ferroviaire Calais - Lille (River Aa) | 14.10 km | |
| Pont de Wattendam | 14.55 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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rubbish disposal
chemical toilet disposal
place to turn
self-operated pump-out
boatyard pump-out
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