South Asia is the southern subregion of Asia that is defined in both geographical and ethnic-cultural terms. South Asia, with a population of 2.04 billion, contains a quarter of the world's population
The region as described in a 1992 work about the geography of Asia: "This greater India is well defined in terms of topography; it is the Indian peninsula, hemmed in by the Himalayas on the north, the Hindu Khush in the west and the Arakanese in the east."