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Boulogne-Billancourt (; often colloquially called simply Boulogne, until 1924 Boulogne-sur-Seine, ) is a wealthy and prestigious commune in the western suburbs of Paris, France, located from the centre of Paris. It is a subprefecture of the Hauts-de-Seine department and thus the seat of the larger arrondissement of Boulogne-Billancourt. It is also part of the Métropole du Grand Paris. Boulogne-Billancourt includes two large islands in the Seine: Île Saint-Germain and Île Seguin. With a population of 121,334 as of 2018, it is the most populous commune in Hauts-de-Seine and most populous suburb of Paris, as well as one of the most densely populated municipalities in Europe.
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