Écluse de Barel, Navigation lock on the Nantes-Brest Canal in Blain, France

Barel Lock is a navigation lock on the Nantes-Brest Canal in Blain, built with masonry chamber walls and metal gates that hold a water level difference of 1.47 metres. Boats enter the chamber, the gates close, and the water is raised or lowered before the downstream gates open.

The lock was built in the 19th century as part of the Nantes-Brest Canal, which transformed trade routes across Brittany. This infrastructure project connected two important regions of France through water transport.

Barel Lock lies on the Nantes-Brest Canal, and its name is shared with the hamlet of Barel in Blain. Anglers fish the canal's edge for coarse fish, and walkers on the towpath stop to watch the lock chamber fill and empty when a boat passes.

Barel Lock is a manual lock on the Nantes-Brest Canal, and boaters must arrange passage with the lock keeper in advance rather than simply arriving. The lock lies at kilometre 16.57 from La Chevallerais, so crews can plan their day's stage around it. On foot or by bike, the towpath passes directly alongside the chamber.

Barel is one of the locks on the Nantes-Brest Canal whose chamber walls and paddle gear a visitor can still read as 19th-century canal engineering. The lock lies at kilometre 16.57 of the canal's course, a reference point used by boaters to locate it between La Chevallerais and Blain.