Boulogne-sur-Mer, frequently referred to as Boulogne, is a port city located in northern France. It serves as a sub-prefecture within the department of Pas-de-Calais and ranks as the third-largest city in that department following Calais and Arras.
The city is situated on the Côte d'Opale, a popular tourist destination along the English Channel coast between Normandy and Calais. It currently stands as the most visited location in the region after the Lille conurbation.
Boulogne-sur-Mer is recognized as France's largest fishing port. The maritime industry there specializes primarily in the fishing of herring.