The Sèvre Nantaise, near Le Longeron
|Native name||La Sèvre nantaise (French)|
|- elevation||215 m (705 ft)|
|Length||141.8 km (88.1 mi)|
|Basin size||2,356 km2 (910 sq mi)|
|- average||9.5 m3/s (340 cu ft/s)|
|Progression||Loire→ Atlantic Ocean|
The Sèvre Nantaise is a river in western France, a left-bank tributary to the Loire. Its total length is 141.8 km (88.1 mi). Its source is in the Deux-Sèvres département, near Secondigny. It flows from south to north through the départements and towns listed here, reaching the river Loire in the city of Nantes, hence the name Sèvre Nantaise (distinguishing it from the Sèvre Niortaise, further south): Deux-Sèvres (Moncoutant, La Forêt-sur-Sèvre), Vendée (Saint-Laurent-sur-Sèvre, Mortagne-sur-Sèvre), Maine-et-Loire (Le Longeron, Torfou), and Loire-Atlantique (Clisson, Le Pallet, Vertou, Rezé. The complete list is on the French page for this river.
The river is navigable over a length of 21.5 km from the village of Monnières to the confluence. It has a horseshoe weir (Chaussée Des Moines) and lock at Vertou, and a tidal sluice open to boats an hour before and after high tide at Pont-Rousseau, in the suburbs of Nantes. Its left-bank tributary, the Petite-Maine, is also navigable over a length of 5 km up to the first disused lock and weir. The river is an important resource for tourism in the region. Beyond the navigable section, the river is a popular destination for canoeists.
- Edwards-May, David, Inland Waterways of France (2010), Imray Ltd., St Ives, Cambs., UK, p. 284
- Sèvre Nantaise with further details by the author of 'Inland Waterways of France'
- Navigation details for 80 French rivers and canals (French waterways website section)
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