Florence rises on the banks of the Arno River in a vast plain surrounded by the Careggi, Fiesole, Settignano, Arcetri and Bellosguardo hills. The river divides the city into two parts: to the north the areas of Santa Maria Novella, San Giovanni and Santa Croce; to the south the "Diladdarno," the area of Santo Spirito. According to statistics produced by UNESCO, 60% of the world's most important works of art are located in Italy and approximately half of these are in Florence.