A town of northern France, in the department of Seine, on the right bank of the Seine, S. W. of Paris and immediately outside the fortifications. Pop. (1906) 49,412. The town has a Gothic church of the 4th and i 5th centuries (restored in 1863) founded in honour of Notre-Dame of Boulogne-sur-Mer. To this fact is due the name of the place, which was previously called Menus-les-St Cloud. Laundrying is extensively carried on as well as the manufacture of metal boxes, soap, oil and furniture, and there are numerous handsome residences. For the neighbouring Bois de Boulogne see Paris.