Greater India, also known as the Indian cultural sphere, the Indic world, or the Hindu Cultural Sphere is an area composed of several countries and regions in South Asia, East Asia and Southeast Asia that were historically influenced by Indian culture, which itself formed from the various distinct indigenous cultures of the Indian subcontinent. It is an umbrella term encompassing the Indian subcontinent and surrounding countries, which are culturally linked through a diverse cultural cline. These countries have been transformed to varying degrees by the adoption and incorporation of cultural and institutional elements from each other.

From around 500 BCE, Asia's expanding land and maritime trade had resulted in prolonged socio-economic and cultural stimulation and diffusion of Buddhist and Hindu beliefs into the region's cosmology, in particular in Southeast Asia and the Far-East.

In Central Asia, the transmission of ideas was predominantly of a religious nature and short-lived, often co-existing with native philosophies such as Zoroastrianism and being quickly supplanted by the rise of Islam. In contrast, the spread of native Indian culture to East Asia was more multifaced and involved wide-ranging cultural exchange beyond religion.

By the early centuries of the common era, most of the principalities of Southeast Asia had effectively absorbed defining aspects of Indian culture, religion, and administration. The notion of divine god-kingship was introduced by the concept of Harihara, and Sanskrit and other Indian epigraphic systems were declared official, like those of the south Indian Pallava dynasty and Chalukya dynasty. These Indianized kingdoms, a term coined by George Cœdès in his work Histoire ancienne des états hindouisés d'Extrême-Orient, were characterized by resilience, political integrity, and administrative stability.

To the north, Indian religious ideas were assimilated into the cosmology of Himalayan peoples, most profoundly in Tibet and Bhutan, and merged with indigenous traditions. Buddhist monasticism extended into Afghanistan, Uzbekistan, and other parts of Central Asia, and Buddhist texts and ideas were accepted in China and Japan in the east. To the west, Indian culture converged with Greater Persia via the Hindu Kush and the Pamir Mountains.

Evolution of the concept

Geographical designation

The concept of the Three Indias was in common circulation in pre-industrial Europe. Greater India was the southern part of South Asia, Lesser India was the northern part of South Asia, and Middle India was the region near the Middle East. The Portuguese form () was used at least since the mid-15th century. The term, which seems to have been used with variable precision, Quote: "Azurara's hyperbole, indeed, which celebrates the Navigator Prince as joining Orient and Occident by continual voyaging, as transporting to the extremities of the East the creations of Western industry, does not scruple to picture the people of the Greater and the Lesser India" sometimes meant only the Indian subcontinent; Quote: "Among all the confusion of the various Indies in Mediaeval nomenclature, "Greater India" can usually be recognized as restricted to the "India proper" of the modern [c. 1910] world." Europeans used a variety of terms related to South Asia to designate the South Asian peninsula, including High India, Greater India, Exterior India and India aquosa.

However, in some accounts of European nautical voyages, Greater India (or India Major) extended from the Malabar Coast (present-day Kerala) to India extra Gangem Quote: "Subsequently the whole area came to be identified with one of the "Three Indies," though whether India Major or Minor, Greater or Lesser, Superior or Inferior, seems often to have been a personal preference of the author concerned. When Europeans began to penetrate into Southeast Asia in earnest, they continued this tradition, attaching to various of the constituent territories such labels as Further India or Hinterindien, the East Indies, the Indian Archipelago, Insulinde, and, in acknowledgment of the presence of a competing culture, Indochina." (lit. "India, beyond the Ganges," but usually the East Indies, i.e. present-day Malay Archipelago) and India Minor, from Malabar to Sind. Farther India was sometimes used to cover all of modern Southeast Asia. Until the fourteenth century, India could also mean areas along the Red Sea, including Somalia, South Arabia, and Ethiopia (e.g., Diodorus of Sicily of the first century BC says that "the Nile rises in India" and Marco Polo of the fourteenth century says that "Lesser India ... contains ... Abash [Abyssinia]").

In late 19th-century geography, Greater India referred to a region that included: "(a) Himalaya, (b) Punjab, (c) Hindustan, (d) Burma, (e) Indo-China, (f) Sunda Islands, (g) Borneo, (h) Celebes, and (i) Philippines.""Review: New Maps," (1912) Bulletin of the American Geographical Society 44(3): 235–240. German atlases distinguished Vorder-Indien (Anterior India) as the South Asian peninsula and Hinter-Indien as Southeast Asia.

Geological connotation Greater India, or Greater India Basin also signifies "the Indian Plate plus a postulated northern extension", the product of the Indian–Asia collision. Although its usage in geology pre-dates Plate tectonic theory,Argand, E., 1924. La tectonique de l' Asie. Proc. 13th Int. Geol. Cong. 7 (1924), 171–372. the term has seen increased usage since the 1970s. It is unknown when and where the India–Asia (Indian and Eurasian Plate) convergence occurred, at or before 52 million years ago. The plates have converged up to ± . The upper crustal shortening is documented from geological record of Asia and the Himalaya as up to approximately less.

Cultural sphere

The use of Greater India to refer to an Indian cultural sphere was popularised by a network of Bengali scholars in the 1920s who were all members of the Calcutta-based Greater India Society. The movement's early leaders included the historian R. C. Majumdar (1888–1980); the philologists Suniti Kumar Chatterji (1890–1977) and P. C. Bagchi (1898–1956), and the historians Phanindranath Bose and Kalidas Nag (1891–1966). Some of their formulations were inspired by concurrent excavations in Angkor by French archaeologists and by the writings of French Indologist Sylvain Lévi. The scholars of the society postulated a benevolent ancient Indian cultural colonisation of Southeast Asia, in stark contrast – in their view – to the Western colonialism of the early 20th century.Review by 'SKV' of The Hindu Colony of Cambodia by Phanindranath Bose [Adyar, Madras: Theosophical Publishing House 1927] in The Vedic Magazine and Gurukula Samachar 26: 1927, pp. 620–1.Lyne Bansat-Boudon, Roland Lardinois, and Isabelle Ratié, Sylvain Lévi (1863–1935), page 196, Brepols, 2007, Quote: "The ancient Hindus of yore were not simply a spiritual people, always busy with mystical problems and never trouble themselves with the questions of 'this world'... India also has its Napoleons and Charlemagnes, its Bismarcks and Machiavellis. But the real charm of Indian history does not consist in these aspirants after universal power, but in its peaceful and benevolent Imperialism – a unique thing in the history of mankind. The colonisers of India did not go with sword and fire in their hands; they used... the weapons of their superior culture and religion... The Buddhist age has attracted special attention, and the French savants have taken much pains to investigate the splendid monuments of the Indian cultural empire in the Far East."

By some accounts Greater India consists of "lands including Burma, Java, Cambodia, Bali, and the former Champa and Funan polities of present-day Vietnam," in which Indian and Hindu culture left an "imprint in the form of monuments, inscriptions and other traces of the historic "Indianizing" process." By some other accounts, many Pacific societies and "most of the Buddhist world including Ceylon, Tibet, Central Asia, and even Japan were held to fall within this web of Indianizing culture colonies" This particular usage – implying cultural "sphere of influence" of India – was promoted by the Greater India Society, formed by a group of Bengali men of letters, Quote: "An equally significant movement is one that brought about among the Indian intelligentsia of Calcutta a few years ago the formation of what is known as the "Greater India Society," whose membership is open "to all serious students of the Indian cultural expansion and to all sympathizers of such studies and activities." Though still in its infancy, this organisation has already a large membership, due perhaps as much as anything else to the enthusiasm of its Secretary and Convener, Dr. Kalidas Nag, whose scholarly affiliations with the Orientalists in the University of Paris and studies in Indochina, Insulindia and beyond, have equipped him in an unusual way for the work he has chosen, namely stimulating interest in and spreading knowledge of Greater Indian culture of the past, present and future. The Society's President is Professor Jadunath Sarkar, Vice-Chancellor of Calcutta University, and its Council is made up largely of professors on the faculty of the University and members of the staff of the Calcutta Museum, as well as of Indian authors and journalists. Its activities have included illustrated lecture series at the various universities throughout India by Dr. Nag, the assembling of a research library, and the publication of monographs of which four very excellent examples have already been printed: 1) Greater India, by Kalidas Nag, M.A., D.Litt. (Paris), 2) India and China, by Prabodh Chandra Bagchi, M.A., D.Litt., 3) Indian Culture in Java and Sumatra, by Bijan Raj Chatterjee, D.Litt. (Punjab), PhD (London), and 4) India and Central Asia, by Niranjan Prasad Chakravarti, M.A., PhD(Cantab.)." and is not found before the 1920s. The term Greater India was used in historical writing in India into the 1970s.

Indianization

The concept of "Indianized kingdoms" and "Indianization", coined by George Coedès, originally describes Southeast Asian principalities that flourished from the early common era as a result of centuries of socio-economic interaction having incorporated central aspects of Indian institutions, religion, statecraft, administration, culture, epigraphy, literature and architecture.National Library of Australia. Asia's French Connection : George Coedes and the Coedes Collection

Expansionist and political concept