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 Rue Georges Clemenceau, Impasse Newton, Impasse Maud Mannoni. Additionally, some smaller parts of Boulevard Gaston Defferre include specific areas like Impasse Léon Harmel, Allée Yvonne de la Biliais, Impasse Général Laperrine adding to the diversity of its landscape.