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The Ganga basin is a part of the composite Ganga-Brahmaputra-Meghna basin, which drains an area of 1,086,000 square kilometres. The basin lies in China, Nepal, India and Bangladesh. It is bounded on the north by the Himalayas, on the west by the Aravalli as well as the ridge separating it from Indus basin, on the south by the Vindhyas and Chotanagpur Plateau and on the east by the Brahmaputra ridge. Its catchment lies in the states of Uttar Pradesh (294,364 km²), Madhya Pradesh (198,962 km²), Bihar (143,961 km²), Rajasthan (112,490 km²), West Bengal (71,485 km²), Haryana (34,341 km²), Himachal Pradesh (4,317 km²) and Delhi (1,484 km²), the whole of Bangladesh, Nepal and Bhutan. The basin has a population of more than 500 million, making it the most populated river basin in the world.

The basin comprises mountainous regions of the Himalayan ranges with dense forests, as well as the sparsely forested Shiwalik Hills and the fertile Gangetic Plains. The central highlands lying to the South of the Great Plains consist of mountains, hills and plateaus intersected by valleys and river plains. The important soil types found in the basin are sand, loam, clay and their combinations such as sandy loam, silty clay etc.

The annual surface water potential of the basin has been assessed as 525 km³ in India, Out of which 250 km³ is utilisable water. Arable area of the basin in India is about 580,000 km², which is 29.5% of the total culturable area of India.

The water related issues of the basin are both due to high and low flow. In India, the states of Uttar Pradesh, Bihar and West Bengal are affected by floods. As Bangladesh lies at the confluence of Brahmaputra River and Ganges River, it suffers from terrible floods almost every year. Many of the flood problems are caused by northern tributaries of Ganga such as Kosi and Mahananda. Besides these problems are also caused by southern tributaries.

The basin is a high earthquake risk area and experts warn that as many as a million deaths could be expected on the Ganges plain, as the southern flank of the Himalayas has not been active enough over past centuries to release the energy accumulated by the millimetre per week upward movement of the Indian plate.

The major river in the basin is the Ganges, whose major tributaries are:

• Yamuna River also Jumuna or Jumna
• Ghaghara River also Gogra or Karnali River
• Son River also Sone River
• Gandaki River also Gandak or Kali-Gandaki
• Kosi River confluence of the Dudh Kosi and Sun Kosi rivers
• For a full list, see the List of rivers in India - the Ganga Basin

• Bibliography on Water Resources and International Law See Ganges and Brahmaputra Rivers. Peace Palace Libray
• S Asia's deadly Himalayan fault

Waters of South Asia
Inland	Indus | Ganges | Yamuna | Chenab | Jhelum | Brahmaputra | Godavari | Narmada | Tapti | Ravi | Beas | Sutlej | Dudh Kosi | Padma | Sarasvati | Krishna | Kaveri | Meghna | Mahanadi | Son | Ghaghara | Betwa | Chambal | Kosi | Sapt Koshi | Tamur | Mo Chhu | Sankosh | Drangme Chhu | Ganga basin | Ganges Delta | Indus Delta | Dal Lake | Pookode Lake | Skeleton Lake | Chilika Lake | Lake Powai | Borith Lake | Saiful Muluk | Gosaikunda | Nizam Sagar | Red Hills Lake | Malampuzha | Kerala Backwaters
Off the Coast	Indian Ocean | Arabian Sea | Laccadive Sea | Bay of Bengal | Gulf of Kutch | Gulf of Khambhat | Palk Bay | Gulf of Mannar
Main	Reservoirs and dams in India | Lakes of India | Rivers of India | Lakes of Pakistan | Rivers of Pakistan | Rivers of Bangladesh | Rivers of Bhutan | Lakes of Nepal | Rivers of Nepal

Geography of South Asia
	Himalaya | Western Ghats | Eastern Ghats | Aravalli Range | The Nilgiris | Vindhya Range | Satpura Range | Garo Hills | Shivalik Hills | Khasi Hills | Annamalai Hills | Cardamom Hills | Sulaiman Mountains | Karakoram | Hindu Kush | Chittagong Hill Tracts | Deccan Plateau | Thar Desert | Makran | Chota Nagpur | Naga Hills | Mysore Plateau | Ladakh Plateau
	Indo-Gangetic plain | Indus River Delta | Ganga basin | Ganges Delta | Atolls of Maldives | Coromandel Coast | Konkan | Lakshadweep | Andaman and Nicobar Islands | Sundarbans | Rann of Kutch | Protected areas of Tamil Nadu |
Main	India | Pakistan | Nepal | Bhutan | Sri Lanka | Bangladesh | The Maldives | Portal:Himalaya region