Travel in the Hauts-de-Seine otherwise aboard an electro-solar catamaran. The Hauts-de-Seine department provides free river shuttles to serve several departmental sites through three ports of call: Issy-les-Moulineaux, Sèvres and Boulogne-Billancourt. Free service, without reservation. Limited places. Additional information on the 3 stops and times on the destination.hauts-de-seine.fr website