Watch FilmoFlix. The film starts in the Department of Ardèche with the Mont Gerbier de Jonc (1551 m) from where emerges the "true" source, the official, most distant one from the mouth of the Loire (1012 km), the longest wild river in France. The work looks closely time-wise on the first kilometers of the river's water flow. The scene's sound meets up with us at the end.