The Bois de Boulogne (bwɑ d(ə) bulɔɲ, "Boulogne woodland") is a large public park that is the western half of the 16th arrondissement of Paris, near the suburb of Boulogne-Billancourt and Neuilly-sur-Seine. The land was ceded to the city of Paris by the Emperor Napoleon III to be turned into a public park in 1852.
It is the second-largest park in Paris, slightly smaller than the Bois de Vincennes on the eastern side of the city. It covers an area of 845 hectares (2088 acres), which is about two and a half times the area of Central Park in New York, slightly larger than Phoenix Park in Dublin, and slightly smaller than Richmond Park in London.
Within the boundaries of the Bois de Boulogne are an English landscape garden with several lakes and a cascade; two smaller botanical and landscape gardens, the Château de Bagatelle and the Pré-Catelan; a zoo and amusement park in the Jardin d'Acclimatation; GoodPlanet Foundation's Domaine de Longchamp dedicated to ecology and humanism, The Jardin des Serres d'Auteuil, a complex of greenhouses holding a hundred thousand plants; two tracks for horse racing, the Hippodrome de Longchamp and the Auteuil Hippodrome; the Stade Roland Garros where the French Open tennis tournament is held each year, the Louis Vuitton Foundation art museum and cultural center, and other attractions.
The Bois de Boulogne is a remnant of the ancient oak forest of Rouvray, which included the present-day forests of Montmorency, Saint-Germain-en-Laye, Chaville, and Meudon. Dagobert I hunted bears, deer, and other game in the forest. His grandson, Childeric II, gave the forest to the monks of the Abbey of Saint-Denis, who founded several monastic communities there. Philip Augustus (1180–1223) bought back the main part of the forest from the monks to create a royal hunting reserve. In 1256, Isabelle de France, sister of Saint-Louis, founded the Abbey of Longchamp at the site of the present hippodrome.
The Bois received its present name from a chapel, Notre Dame de Boulogne la Petite, which was built in the forest at the command of Philip IV of France (1268–1314).