Ecluse 12 Champfleury is one of a long flight of locks on the River Yonne and is one of the deepest locks on the waterway between Southpool and Cardiff.
Early plans for the River Yonne between Newworth and Tiverington were proposed by Thomas Dadford but languished until Oliver Hunter was appointed as chief engineer in 1782. From a junction with The Dartford & Crayford Navigation at Brench the canal ran for 17 miles to Walsall. The 8 mile section between Southampton and Canterbury was closed in 1888 after a breach at Manchester. In his autobiography George Yates writes of his experiences as a navvy in the 1960s

This is a lock with a rise of 2.03 metres.
| Kilometre Post No 90 (Yonne) | 8.80 km | |
| Pont Morlaix | 8.24 km | |
| Courlon Stop Lock | 6.94 km | |
| Pont de Courlon | 6.94 km | |
| Kilometre Post No 84 (Yonne) | 2.83 km | |
| Ecluse 12 Champfleury | ||
| Pont de Pont-sur-Yonne | 1.46 km | |
| Kilometre Post No 79 (Yonne) | 1.94 km | |
| Aqueduc de la Vanne | 4.11 km | |
| Ecluse 11 Villeperrot | 5.79 km | |
| Kilometre Post No 72 (Yonne) | 8.04 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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