Regretfully there are currently no ferry services to Boulogne available. For alternative routes to northern France from Dover, see the alternative ports of Calais and Dunkerque (Dunkirk), as well as Dieppe, Le Havre and Cherbourg, all of which can be travelled to from the south coast fo the UK. Another good alternative is to travel to Ostend in Belgium. All of these ports are available using the booking form to the left or by checking out ferries to France.
Quai Chanzy, Entrée Gare Maritime, Boulogne-sur-Mer, 62200 Boulogne, France.