Frédéric Sauvage basin

The Liane is a 37 km river in the Pas-de-Calais department in northern France. It rises in Quesques and flows into the English Channel at Boulogne-sur-Mer. Other communes along its length include: Selles, Brunembert, Bournonville, Alincthun, Crémarest, Wirwignes, Questrecques, Samer, Carly, Hesdigneul-lès-Boulogne, Isques, Saint-Léonard, Hesdin-l'Abbé, Condette, Saint-Étienne-au-Mont, and Outreau.

Gare de Boulogne-Ville is one of the railway stations serving the town Boulogne-sur-Mer, Pas-de-Calais department, northern France. The other station is Gare de Boulogne-Tintelleries.

The canton of Boulogne-sur-Mer-2 is an administrative division of the Pas-de-Calais department, in northern France. It was created at the French canton reorganisation which came into effect in March 2015. Its seat is in Boulogne-sur-Mer.It consists of the following communes:BaincthunBoulogne-sur-Mer (partly)EchinghenLe PortelSaint-Martin-Boulogne

The Communauté d'agglomération du Boulonnais is the communauté d'agglomération, an intercommunal structure, centred on the city of Boulogne-sur-Mer. It is located in the Pas-de-Calais department, in the Hauts-de-France region, northern France. It was created in January 2000. Its population was 118,623 in 2014, of which 43,170 in Boulogne-sur-Mer proper.