The Aron () is a long river in central France. It is a right tributary of the
Loire
The Loire (, also ; ; oc, Léger, ; la, Liger) is the longest river in France and the 171st longest in the world. With a length of , it drains , more than a fifth of France's land, while its average discharge is only half that of the Rhôn ...
, which it meets at Decize. It flows through the department of
Nièvre
Nièvre () is a department in the Bourgogne-Franche-Comté region, central-east France. Named after the river Nièvre, it had a population of 204,452 in 2019.Crux-la-Ville, about north-east of
Nevers
Nevers ( , ; la, Noviodunum, later ''Nevirnum'' and ''Nebirnum'') is the prefecture of the Nièvre Departments of France, department in the Bourgogne-Franche-Comté Regions of France, region in central France. It was the principal city of the ...
. It flows in a southerly direction, through the towns of Châtillon-en-Bazois and Cercy-la-Tour, and empties into the Loire at Decize. For much of its length, from Châtillon-en-Bazois to Decize, the river flows parallel to the Canal du Nivernais.
Among its tributaries is the Alène.