Paris has 20 districts (arrondissements) that spiral around the Seine River. The 1st, 2nd, 3rd, and 4th arrondissements constitute the heart of the city, founded on the Île de la Cité.The 5th, 6th, and 7th arrondissements are known as birthplaces of cultural trends and movements. The 8th and 9th arrondissements are neighborhoods dedicated to business and commerce (Champs-Élysées and department stores). The remaining arrondissements are primarily residential, with a few sites of interest.