🇫🇷 Fos-sur-Mer, Bouches-du-Rhône Département, Provence-Alpes-Côte d'Azur, France. Fos-sur-Mer is situated about 50 km (31 mi) north west of Marseille, on the Mediterranean coast, and to the west of the Étang de Berre. The city has 6 km (3.7 mi) of sand beach.
Economy Fos is the site of a major port development operated by the Autonomous Port of Marseille. The facilities include container handling terminals and a gas (methane) terminal. The waterside location of the industrial zone is attractive to heavy industry including steel. The steel group ArcelorMittal has its Sollac Méditerranée plant here. The presence of the steel, chemistry and oil industries means that pollution levels are high.
Fos-sur-Mer has a population of over 14,007 people. Fos-sur-Mer also forms part of the wider Istres arrondissement which has a population of over 327,971 people. Fos-sur-Mer is situated 50 km north-west of Marseille.