Surrounded by mountains and narrow coastal areas, it is the natural backbone of the Italian peninsula and has a great influence on Italian human geography. The Apennine Mountains are in a huge arc, starting from the Kadibona Pass near the Alps in the northwest and extending to the Egadi Islands in the west of Sicily, with a total length of about 1400km and a width of 40-200 km. The highest point of the mountain range itself above the Italian peninsula is Mount Kono, which is 29 12 meters high. The mountains are as far away as Calabria in the southern tip of Italy, and the general trend is northwest-southeast; Then, starting from Calabria, the regional trend became south first and then west.