South Asia is the southern region of the Asian continent, which comprises the sub-Himalayan countries. Topographically, it is dominated by the Indian Plate, which rises above sea level as the Indian subcontinent south of the Himalayas and the Hindu Kush. South Asia is surrounded (clockwise, from west) by Western Asia, Central Asia, Eastern Asia, Southeastern Asia and the Indian Ocean. According to the United Nations geographical region,[2] South Asia comprises the countries of India, Pakistan, Bangladesh, Bhutan, Nepal, Maldives, Afghanistan, Iran and Sri Lanka.

South Asia is home to well over one fifth of the world's population, making it both the most populous and most densely populated geographical region in the world. The South Asian Association for Regional Cooperation is an economic cooperation organization in the region.

The remote pre-history of South Asia culminates in the Indus Valley Civilization, which is followed by the legends of ancient Vedic period and the sketchy references to the rise and fall of Mahajanapadas - the precursors of regional kingdoms and later ancient empires - ending in the historical accounts of medieval empires and the arrival of European traders who later became the rulers. Almost all South Asian countries were under direct or indirect European Colonial subjugation at some point. Much of modern India, Pakistan, Bangladesh and Myanmar were gradually occupied by Great Britain - starting from 1757, reaching their zenith in 1857 and ruling till 1947. Nepal and Bhutan were to some extent protectorates of Great Britain until after World War II. In the millennia long history of South Asia, this European occupation period is rather short, but its proximity to the present and its lasting impact on the region make it prominent.