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Which body of water borders Marseille?

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View of the old port of Marseille, France, with numerous boats docked in the harbor and the city's terracotta-roofed buildings rising up a hill, topped by the Notre-Dame de la Garde basilica. — Marseille Seaside view of the Old Port of Marseille, France.

Marseille is a major port city located on the Mediterranean Sea in southern France. Specifically, the city is situated on the Gulf of Lion, an embayment of the Mediterranean.1