The river Isole flows through the department of Finistère in the region of Brittany in France. It is 48.2 km long and its basin area is 227 km². Its source is near Roudouallec. Another town on the Isole is Scaër. At the town of Quimperlé it is joined by the Ellé to form the Laïta, which flows into the Atlantic Ocean at Le Pouldu.