Monaco, French Principauté de Monaco, sovereign principality located along the Mediterranean Sea in the midst of the resort area of the Côte d’Azur (French Riviera). The city of Nice, France, lies 9 miles (15 km) to the west, the Italian border 5 miles (8 km) to the east. Monaco’s tiny territory occupies a set of densely clustered hills and a headland that looks southward over the Mediterranean. Many unusual features, however, have made Monaco among the most luxurious tourist resorts in the world and have given it a fame far exceeding its size.