Mont Blanc spans the French -- Italian border , at 4,810 m is the highest mountain in the Alps .
Alpen -- The mountains were formed over tens of millions of years as the African and Eurasian tectonic plates collided .
Mont Blanc spans the French -- Italian border , at 4,810 m is the highest mountain in the Alpen .
Alpen -- The mountains were formed over tens of millions of years as the African and Eurasian tectonic plates collided .