The Buëch is a river in southeastern France, right tributary to the Durance. Its source is in the Dauphiné Alps, near the Grand Ferrand peak. It flows generally southward, for most of its course in the Hautes-Alpes département. It flows into the Durance in Sisteron.Départements and towns along the Buëch include: Drôme: Lus-la-Croix-Haute Hautes-Alpes: Aspres-sur-Buëch Serres Laragne-Montéglin Alpes-de-Haute-Provence: Mison Sisteron