A Topographical Map of Asia
A topographical map of Asia. A graphic answer to the question of why Tibet is called the Roof of the World: the average height of its territory is 4,000 m above sea level, and it is the largest mountain system by area. A mountain system on the continent. The Himalayas and the Tibetan Plateau are mountains lying in the south and centre of Asia, and they are considered the highest on the continent.