The Solin is a 31.3-kilometre (19.4 mi) long river in the Loiret département, north-central France. Its source is at Le Moulinet-sur-Solin, 2 kilometres (1.2 mi) south of the village. It flows generally north-northeast. It is a left tributary of the Loing, into which it flows at Châlette-sur-Loing.