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Boulogne-sur-Mer (French: [bulɔɲ syʁ mɛʁ] (listen); Picard: Boulonne-su-Mér; Dutch: Bonen; Latin: Gesoriacum or Bononia), often called just Boulogne (UK: , US: ), is a coastal city in Northern France. It is a sub-prefecture of the department of Pas-de-Calais. Boulogne lies on the Côte d'Opale, a touristic stretch of French coast on the English Channel between Calais and Normandy, and the most visited location in the region after Lille conurbation.

Operation Wellhit was the Second World War operation by the 3rd Canadian Division (Canadian 1st Army) to take the fortified port of Boulogne in northern France. At first, the 9th Canadian Infantry Brigade had hoped to take Boulogne as part of its advance up the coast. The defences, however, brought them to a halt 5 miles (8.0 km) from the city.

The Battle of Boulogne was the defence of the port of Boulogne-sur-Mer by French, British and Belgian troops, during the Battle of France of the Second World War in 1940. The battle was fought at the same time as the Siege of Calais, just before Operation Dynamo, the evacuation of the British Expeditionary Force (BEF) through Dunkirk.

The Basilica of Notre-Dame de Boulogne, otherwise the Basilica of Our Lady of the Immaculate Conception (French: Notre-Dame de Boulogne; Basilique Notre-Dame-de-l'Immaculée-Conception), is a minor basilica located in Boulogne-sur-Mer in the Pas-de-Calais département of northern France. The basilica, a prominent landmark of the city with its 101 metre high dome, was built between 1827 and 1875 on the site of the medieval cathedral of Boulogne: the basilica is still known locally as the "cathedral", although the present church has never had that status.

The Château de Boulogne-sur-Mer is a castle in the French seaport of Boulogne-sur-Mer, in the Pas-de-Calais département. It houses the Boulogne museum.The castle was built in the 13th century by Philippe Hurepel (1180-1234), count of Boulogne and son of Philip II of France. Following the death of his half-brother, king Louis VIII after a short three-year reign, Hurepel was one of the leaders of a rebellion against the regent, Blanche de Castille, mother of the minor Louis IX.

The Raid on Boulogne in 1804 was a naval assault by elements of the Royal Navy on the fortified French port of Boulogne, during the Napoleonic Wars. It differed from the conventional tactics of naval assaults of the period by utilizing a wide range of new equipment produced by the American-born inventor Robert Fulton, with the backing of the Admiralty.