Sèvre Nantaise in the context of "Loire (river)"

The Loire (/lwɑːr/ LWAR, US also /luˈɑːr/ loo-AR, French: [lwaʁ] ; Occitan: Léger [ˈledʒe]; Arpitan: Lêre; Breton: Liger [ˈliːɡɛr]; Latin: Liger) is the longest river in France and the 171st longest in the world. With a length of 1,006 kilometres (625 mi), it drains 117,054 km (45,195 sq mi), more than a fifth of France's land, while its average discharge is only half that of the Rhône.

It rises in the southeastern quarter of the French Massif Central in the Cévennes range (in the department of Ardèche) at 1,350 m (4,430 ft) near Mont Gerbier de Jonc; it flows north through Nevers to Orléans, then west through Tours and Nantes until it reaches the Bay of Biscay (Atlantic Ocean) at Saint-Nazaire. Its main tributaries include the rivers Nièvre, Maine and the Erdre on its right bank, and the rivers Allier, Cher, Indre, Vienne, and the Sèvre Nantaise on the left bank.

Deux-Sèvres (French pronunciation: [dø sɛvʁ] , Poitevin-Saintongese: Deùs Saevres) is a French department. Deux-Sèvres literally means "two Sèvres": the Sèvre Nantaise and the Sèvre Niortaise are two rivers which have their sources in the department. It had a population of 374,878 in 2019.

The Thouet (French pronunciation: [twɛ]) is a tributary of the Loire in the Nouvelle-Aquitaine and Pays de la Loire regions of western France. The Thouet rises at Secondigny, close to the source of the Sèvre Nantaise, and joins the Loire just to the west of Saumur. It is 142.6 km (88.6 mi) long, and drains an area of 3,396 km (1,311 sq mi).

The river's name derives from the ancient Gallic word for tranquil.