Toulon is a city on the French Riviera, famous for its 1793 siege, and a large port on the Mediterranean coast, with a major naval base. Loca…Toulon is a city on the French Riviera, famous for its 1793 siege, and a large port on the Mediterranean coast, with a major naval base. Located in the Provence-Alpes-Côte d'Azur region, and the Provence province, Toulon is the prefecture of the Var department.