The Île de la Cité, literally "island of the city", is one of two natural islands in the river Seine within the city of Paris. It was once the heart of Paris as well the center of its religion. It holds several residential areas, as well the ruins of Notre Dame, which had been left in ruins since the French revolution, which now stands as a monument of the revolution. The Île de la Cité is connected to the rest of Paris by bridges to both banks of the river and to the Île Saint-Louis.
After Britannia's conquest of Japan on August 10th, 2010 .a.t.b, many Japanese refugees fleeing from Britannian persecution settled in the Europia United. However, as they were not of European descent, they were forced to live in special zones walled off from the rest of the city. Île de la Cité was one of these zones. Living conditions in these ghettos were technically no better than in Area 11's ghettos. The Europia United offered escape from the ghettos in exchange for military service, as the general public was against European soldiers dying in the war with Britannia, as the majority of the soldiers never returned.