Slightly smaller than Texas, France covers 211,208 square miles (547,030 square kilometers). As the country is hexagonal in shape, it is sometimes referred to as Hexagone. The terrain is varied, from plains to mountains and forests to farmland. Mountains stretch along the borders with Spain, Italy, and Switzerland. France boasts on of Europe's highest peaks, Mount Blanc, at 15,771 feet (4,807 meters). The Rhine River forms part of the border with Germany. A flat plain with rolling hills dominates the northern area. The southern climate is Mediterranean, with cool, moist winters and hot, dry summers. The north is temperate and rainy. The west is also rainy and influenced by the Atlantic, which moderates winter temperatures. The central, east, and upland areas have a continental climate, with fluctuating temperatures; in the mountains, thunderstorms and prevalent in summer. French sovereignty extends to the island of Corsica (Corse) as well as 10 overseas territories and departements (overseas divisions of France that have representatives in the French government as well as some local autonomy).