The mountains were formed over tens of millions of years as the African and Eurasian tectonic plates collided. Extreme shortening caused by the event resulted in marine sedimentary rocks rising by thrusting and folding into high mountain peaks such as Mont Blanc and the Matterhorn. Mont Blanc spans the French—Italian border, and at 4, m 15, ft is the highest mountain in the Alps. The Alpine region area contains 82 peaks higher than 4, m 13, ft.
The altitude and size of the range affect the climate in Europe; in the mountains, precipitation levels vary greatly and climatic conditions consist of distinct zones. Wildlife such as ibex live in the higher peaks to elevations of 3, m 11, ft , and plants such as edelweiss grow in rocky areas in lower elevations as well as in higher elevations.
Evidence of human habitation in the Alps goes back to the Palaeolithic era. Hannibal notably crossed the Alps with a herd of elephants, and the Romans had settlements in the region. In , Napoleon crossed one of the mountain passes with an army of 40, The 18th and 19th centuries saw an influx of naturalists, writers, and artists, in particular, the Romanticists, followed by the golden age of alpinism as mountaineers began to ascend the peaks of the Alps.
The Alpine region has a strong cultural identity. Traditional practices such as farming, cheesemaking, and woodworking still thrive in Alpine villages.
However, the tourist industry began to grow early in the 20th century and expanded significantly after World War II, eventually becoming the dominant industry by the end of the century. As of , [update] the region is home to 14 million people and has million annual visitors. Similarly, the river god Alpheus is also supposed to derive from the Greek alphos and means whitish. In his commentary on the Aeneid of Virgil, the late fourth-century grammarian Maurus Servius Honoratus says that all high mountains are called Alpes by Celts.
