Boulogne-sur-Mer is a city in northern France. It is a sub-prefecture of the department of Pas-de-Calais. The population of the city was 44,859 in the 1999 census, whereas that of the whole metropolitan area was 135,116. Boulogne-sur-Mer is the most important fishing port in France. 7,000 inhabitants derive part or all of their livelihoods from fishing. IFREMER (the French Research Institute for Exploitation of the Sea) and the Pasteur Institute are located in Boulogne Port. read more…