Explore details about location Boulevard Gaston Defferre. Boulevard Gaston Defferre is a location situated within the La Roche-sur-Yon alongside other areas such as Boulevard des États-Unis, Rond-Point André Gueffier, Impasse du Châtelet. Additionally, some smaller parts of Boulevard Gaston Defferre include specific areas like Boulevard Rivoli, Allée de la Courtaisière adding to the diversity of its landscape.