The Gulf of Lion or Gulf of Lions is a wide embayment of the Mediterranean coastline of Catalonia in Spain with Languedoc-Roussillon and Provence in France, extending from Begur in the west to Toulon in the east.
The chief port on the gulf is Marseille. Toulon is another important port. The fishing industry in the gulf is based on hake (Merluccius merluccius), being bottom-trawled, long-lined and gill-netted and currently declining from overfishing.