Brahmaputra

The Brahmaputra is one of Asia's largest rivers, draining roughly 580,000 square kilometres across China, India, Bhutan and Bangladesh over a course of about 2,900 kilometres. It originates near Lake Manasarovar in the Kailash range of southwestern Tibet, where it is called the Yarlung Tsangpo, and runs eastward through the Tibetan plateau before executing the dramatic Great Bend around Namcha Barwa, where it carves the world's deepest canyon. It enters India in Arunachal Pradesh as the Siang (or Dihang), becomes the Brahmaputra in Assam after its confluence with the Lohit and Dibang, and finally crosses into Bangladesh, where it is known as the Jamuna before merging with the Ganga (Padma) and Meghna to form the world's largest delta. Major tributaries include the Subansiri, Manas, Teesta and Kameng.

Hydrologically the Brahmaputra is distinctive for its enormous sediment load, braided channels and a steep gradient that produces violent annual flooding in the Assam valley, repeatedly reshaping Majuli, the large river island. It is one of the few major rivers with a male name in Indian tradition (the "son of Brahma"). Unlike the Indus and Ganga systems, the Brahmaputra is not governed by a comprehensive water-sharing treaty among riparian states. India and China operate only through Expert-Level Mechanism arrangements and a Memorandum of Understanding (renewed periodically since 2002, lapsed and partially restored) under which China shares hydrological data on the Yarlung Tsangpo during the flood season — data flows were suspended after the 2017 Doklam standoff and later resumed.

The river is central to contemporary Sino-Indian strategic anxiety. China has constructed run-of-the-river projects such as Zangmu (operational 2015) and, most significantly, in December 2024 approved a massive hydropower project on the Great Bend near Medog, projected to be the world's largest dam, raising Indian concerns over water diversion, flow manipulation and sediment retention. India has responded by advancing its own projects, including the proposed Upper Siang multipurpose storage in Arunachal Pradesh, partly to assert prior-appropriation claims. Bangladesh, the lowest riparian, depends heavily on Brahmaputra flows for agriculture in the north and remains acutely vulnerable to upstream interventions. As of 2026 there is no trilateral institutional framework, and the absence of China from the UN Watercourses Convention (1997) limits legal recourse.

For the examinations the Brahmaputra is high-value across multiple papers. In UPSC Geography (GS Paper I and optional) it is tested on its course, the Great Bend, braided drainage, Assam flooding, Majuli and tributary identification, often through map-based prelims questions. In China Foreign Policy and FSOT/IR contexts it appears as a case study in transboundary water disputes, hydro-hegemony of the upper riparian, and the China–India–Bangladesh basin politics. Typical mains question angles ask candidates to evaluate the prospects of cooperative basin management, the strategic implications of Chinese dam-building, and India's water-security options absent a binding treaty.