The Mayenne is a lovely river in the Anjou region and is navigable from Angers in the Loire-valley to the city of Mayenne.
Very attractive for the wine, the castles and the mild climate.
Suggestions for cruises from Angers
Angers – Chenillé-Changé – Château-Gontier – Entrammes – Angers: 252 km, 21 locks, 35 hours
Angers – Chenillé-Changé – Laval – Mayenne – Segré – Angers: 392 km, 35 locks, 80 hours