Arc River is a river located in the French Alps, flowing through the Savoie region of France. It is approximately 125 kilometers long and is a tributary of the Isère River. The river is known for its picturesque landscapes and is popular for outdoor activities such as hiking and fishing. The Arc River originates from the Glacier de l'Arc and flows through several towns, including Bourg-Saint-Maurice. It eventually joins the Isère near the town of Aiguebelle. The river plays a significant role in the local ecosystem and contributes to the region's natural beauty.