The Neste is a river in southern France, a left tributary of the Garonne. It rises from several sources around Saint-Lary-Soulan, central Pyrenees and flows throughthe following departments and towns: Hautes-Pyrénées: Saint-Lary-Soulan, Arreau, La Barthe-de-Neste Haute-Garonne: MontréjeauTwo rivers, the Neste d'Aure and the Neste du Louron, join to form the Neste at Arreau. The Neste flows into the Garonne in Montréjeau.