Boulogne refers to several places and entities, primarily in France. The most notable is Boulogne-sur-Mer, a coastal city in northern France known for its fishing port and historical significance. Another important location is Boulogne-Billancourt, a suburb of Paris that is recognized for its cultural and economic contributions. In addition to these cities, "Boulogne" can also refer to various other places around the world, including Boulogne in Argentina. The term may also relate to historical events or figures associated with these locations, such as the Battle of Boulogne or Napoleon Bonaparte's campaigns.