The Isère is a river that flows through Grenoble, France. It is a major tributary of the Rhône and is approximately 290 km long. The Isère originates in the mountains of Savoie and flows through the city of Grenoble before joining the Rhône near Valence. It is an important source of hydroelectric power and is used for irrigation and transportation. The Isère is also a popular destination for recreational activities such as fishing, canoeing, and swimming.