Chantilly's Department is the Oise department in France. It is located in the northern part of the country and is part of the Picardy region. It is bordered by the departments of Aisne, Somme, Seine-et-Marne, Val-d'Oise, and Eure. The department is named after the city of Chantilly, which is the capital of the department. The main economic activities in the area are agriculture, tourism, and industry. The department is also home to several historical sites, such as the Château de Chantilly and the Château de Pierrefonds.