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Wikipedia says:
For other places known as Boulogne, see Boulogne. Boulogne-Billancourt (often colloquially called simply Boulogne) is a commune in the western suburbs of Paris, France. It is located 8.2 km. (5.1 miles) from the centre of Paris. Boulogne-Billancourt is a sous-préfecture of the Hauts-de-Seine département, being the seat of the Arrondissement of Boulogne-Billancourt.
Boulogne-Billancourt is the most populous suburb of Paris and one of the most densely populated municipalities in Europe. Formerly an important industrial site, it has successfully recovered into business activities and is now home to major communication companies headquarters in the business district of the Val de Seine. (...) more....


