The Indian subcontinent is a physiographical region in Southern Asia, mostly situated on the Indian Plate, projecting southwards into the Indian Ocean from the Himalayas. Geopolitically, it spans major landmasses from the countries of Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, and Sri Lanka. Although the terms "Indian subcontinent" and "South Asia" are often used interchangeably to denote the region, the geopolitical term of South Asia frequently includes Afghanistan, which is not considered part of the subcontinent.
Geologically, the subcontinent originates from Insular India, an isolated landmass that rifted from the supercontinent of Gondwana during the Cretaceous and merged with the landmass of Eurasia nearly 55 million years ago, forming the Himalayas. Historically, as well as to the present day, it is and has been the most populated region in the world, holding roughly 20–25 percent of the global population at all times in history. Geographically, it is the peninsular region in Southern Asia located below the Third Pole, delineated by the Himalayas in the north, the Hindu Kush in the west, and the Indo-Burman Ranges in the east. The neighboring geographical regions around the subcontinent include the Tibetan Plateau to the north, the Indochinese Peninsula to the east, and the Iranian Plateau to the west and the Indian Ocean to the south.
Name
In many historical sources, the region surrounding and southeast of the Indus River was referred to simply as "India". Historians continue to use this term to refer to the whole of the Indian subcontinent in discussions of history up until the era of the British Raj. During this period, "India" came to refer to a distinct political entity that later became a nation-state.
According to the Oxford English Dictionary, the term subcontinent signifies a "subdivision of a continent which has a distinct geographical, political, or cultural identity" and also a "large land mass somewhat smaller than a continent". Its use to signify the Indian subcontinent is evidenced from the early twentieth century when most of the territory was either part of the British Empire or allied with them. It was a convenient term to refer to the region comprising both British India and the princely states.
The term has been particularly common in the British Empire and its successors, while the term South Asia is the more common usage in Europe and North America. According to historians Sugata Bose and Ayesha Jalal, the Indian subcontinent has come to be known as South Asia "in more recent and neutral parlance". Indologist Ronald B. Inden argues that the usage of the term South Asia is becoming more widespread since it clearly distinguishes the region from East Asia. While South Asia, a more accurate term that reflects the region's contemporary political demarcations, is replacing the Indian subcontinent, a term closely linked to the region's colonial heritage, as a cover term, the latter is still widely used in typological studies.
Since the partition of India, citizens of Pakistan (which became independent of British India in 1947) and Bangladesh (which became independent of Pakistan in 1971) often perceive the use of the Indian subcontinent as offensive and suspicious because of the dominant placement of India in the term. As such it is being increasingly less used in those countries. Meanwhile, many Indian analysts prefer to use the term because of the socio-cultural commonalities of the region. The region has also been called the "Asian subcontinent", the "South Asian subcontinent", as well as "India" or "Greater India" in the classical and pre-modern sense.
Geology
The Indian subcontinent was formerly part of Gondwana, a supercontinent formed during the late Neoproterozoic and early Paleozoic. Gondwana began to break up during the Mesozoic, with Insular India separating from Antarctica 130-120 million years ago and Madagascar around 90 million years ago, during the Cretaceous. Insular India subsequently drifted northeastwards, colliding with the Eurasian Plate nearly 55 million years ago, during the Eocene, forming the Indian subcontinent. The zone where the Eurasian and Indian subcontinent plates meet remains geologically active, prone to major earthquakes.