A historical movement of population from the arid zones of Central Asia has followed the mountain passes into the Indian subcontinent. Robertson, who was in touch with Ms. The earliest postulated expansion out of the steppe is that of the Indo-Europeans , who spread their languages into the Middle East, South Asia, and the borders of China, where the Tocharians resided.
Although New Guinea is mentioned occasionally in this article, it generally is not considered a part of Asia. Asia, Europe and Africa make up a single continuous landmass— Afro-Eurasia except for the Suez Canal —and share a common continental shelf. The Mongol Empire conquered a large part of Asia in the 13th century, an area extending from China to Europe. Some are ethnic names. Asia is more a geographic term than a homogeneous continent, and the use of the term to describe such a vast area always carries the potential of obscuring the enormous diversity among the regions it encompasses.