Together with the river Mayenne it forms the river Maine, which is a tributary to the river Loire.
== Geografija ===== Porečje ===* Ozanne* Yerre* Braye* Aigre* Conie=== Departmaji in kraji ===Reka Loir teče skozi naslednje departmaje in kraje:* Eure-et-Loir: Illiers-Combray, Bonneval, Châteaudun, Cloyes-sur-le-Loir,* Loir-et-Cher: Morée, Vendôme, Montoire-sur-le-Loir,* Sarthe: La Chartre-sur-le-Loir, Château-du-Loir, Le Lude, La Flèche,* Maine-et-Loire: Durtal, Seiches-sur-le-Loir.