La Seyne-sur-Mer is located in Marseille city, France at the 43.0982, 5.8847 coordinates. Distance from La Seyne-sur-Mer to other cities. are listed below, click on the city name to find distance between. Distance from La Seyne-sur-Mer to Nice 130 km, to Toulon 4 km, to Aix-en-Provence 59 km. The green marker indicates the location of La Seyne-sur-Mer.