Eugénie-les-Bains is a commune in the Landes department, Nouvelle-Aquitaine, southwestern France. Eugénie-les-Bains is best known fo…Eugénie-les-Bains is a commune in the Landes department, Nouvelle-Aquitaine, southwestern France. Eugénie-les-Bains is best known for housing a spa resort and three restaurants, all belonging to chef Michel Guérard, inventor of cuisine minceur.