The vast majority of France's territory and population is situated in Western Europe and is called Metropolitan France, to distinguish it from the country's various overseas polities. It is bordered by the North Sea in the north, the English Channel in the northwest, the Atlantic Ocean in the west and the Mediterranean sea in the southeast. Its land borders consist of Belgium and Luxembourg in the northeast, Germany and Switzerland in the east, Italy and Monaco in the southeast, and Andorra and Spain in the south and southwest. Except for the northeast, most of France's land borders are roughly delineated by natural boundaries and geographic features: to the south and southeast, the Pyrenees and the Alps and the Jura, respectively, and to the east, the Rhine river. Due to its shape, France is often referred to as '''' ("The Hexagon"). Metropolitan France includes various coastal islands, of which the largest is Corsica. Metropolitan France is situated mostly between latitudes 41° and 51° N, and longitudes 6° W and 10° E, on the western edge of Europe, and thus lies within the northern temperate zone. Its continental part covers about 1000 km from north to south and from east to west.