context: Isère [izɛʁ] is a 286 kilometer long tributary of the Rhône in southeastern France, [1] in the Rhône-Alpes region. It begins in the Italian border of the Alps, close to the Val d'Isère ski resort, and descends to Rhône in Pont-de-l'Isère. The tributaries of the river include Arly, Arc and Drac. The department of Isère is named after the river.
question: How Long is the River Isère?
answers.text: 286 kilometer