page_title: Ganges
section_title: Hydrology
hierarchical_section_title: Ganges / Hydrology
caption_attribution_description: English: This photograph is taken from the bank of river Hoogly (Ganges) in Kolkata. The Howrah bridge can be seen in the backdrop which became synonymous with Kolkata. The boats with blue hood in the from are available for leisure ride, which are manually driven. My Photoblog
context_page_description: The Ganges or Ganga, is a trans-boundary river of Asia which flows through India and Bangladesh. The 2,704 km river originates from the Gangotri Glacier of western Himalayas in the Indian state of Uttarakhand, and flows south and east through the Gangetic Plain of India and Bangladesh, eventually emptying into the Bay of Bengal.
  The Ganges is a lifeline to millions who live along its course. It is a sacred river and worshipped as the goddess Ganga in Hinduism. It has been important historically; many former provincial or imperial capitals have been located on its banks.
  The Ganges is threatened by severe pollution. This poses a danger not only to humans but also to animals; the Ganges is home to approximately 140 species of fish and 90 species of amphibians. The river also contains reptiles and mammals, including critically endangered species such as the Gharial and South Asian river dolphin. The levels of fecal coliform bacteria from human waste in the river near Varanasi are more than a hundred times the Indian government's official limit.
context_section_description: Major left-bank tributaries include Gomti River, Ghaghara River, Gandaki river, and Kosi river; major right-bank tributaries include Yamuna river, Son river, Punpun and Damodar.The hydrology of the Ganges River is very complicated, especially in the Ganges Delta region. One result is different ways to determine the river's length, its discharge, and the size of its drainage basin.
  The name Ganges is used for the river between the confluence of the Bhagirathi and Alaknanda rivers, in the Himalayas, and the first bifurcation of the river, near the Farakka Barrage and the India-Bangladesh Border. The length of the Ganges is frequently said to be slightly over 2,600 km (1,600 mi) long, about 2,601 km (1,616 mi), 2,525 km (1,569 mi)or2,650 km (1,650 mi). In these cases the river's source is usually assumed to be the source of the Bhagirathi River, Gangotri Glacier at Gomukh and its mouth being the mouth of the Meghna River on the Bay of Bengal. Sometimes the source of the Ganges is considered to be at Haridwar, where its Himalayan headwater streams debouch onto the Gangetic Plain.
  In some cases, the length of the Ganges is given by its Hooghly River distributary, which is longer than its main outlet via the Meghna River, resulting in a total length of about 2,704 km (1,680 mi), if taken from the source of the Bhagirathi, or 2,321.50 km (1,442.51 mi), if from Haridwar to the Hooghly's mouth. In other cases the length is said to be about 2,304 km (1,432 mi), from the source of the Bhagirathi to the Bangladesh border, where its name changes to Padma.
  For similar reasons, sources differ over the size of the river's drainage basin. The basin covers parts of four countries, India, Nepal, China, and Bangladesh; eleven Indian states, Himachal Pradesh, Uttarakhand, Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Bihar, Jharkhand, Punjab, Haryana, Rajasthan, West Bengal, and the Union Territory of Delhi. The Ganges basin, including the delta but not the Brahmaputra or Meghna basins, is about 1,080,000 km² (420,000 sq mi), of which 861,000 km² (332,000 sq mi) is in India (about 80%), 140,000 km² (54,000 sq mi) in Nepal (13%), 46,000 km² (18,000 sq mi) in Bangladesh (4%), and 33,000 km² (13,000 sq mi) in China (3%). Sometimes the Ganges and Brahmaputra–Meghna drainage basins are combined for a total of about 1,600,000 km² (620,000 sq mi) or 1,621,000 km² (626,000 sq mi). The combined Ganges-Brahmaputra-Meghna basin (abbreviated GBM or GMB) drainage basin is spread across Bangladesh, Bhutan, India, Nepal, and China.
  The Ganges basin ranges from the Himalaya and the Transhimalaya in the north, to the northern slopes of the Vindhya range in the south, from the eastern slopes of the Aravalli in the west to the Chota Nagpur plateau and the Sunderbans delta in the east. A significant portion of the discharge from the Ganges comes from the Himalayan mountain system. Within the Himalaya, the Ganges basin spreads almost 1,200 km from the Yamuna-Satluj divide along the Simla ridge forming the boundary with the Indus basin in the west to the Singalila Ridge along the Nepal-Sikkim border forming the boundary with the Brahmaputra basin in the east. This section of the Himalaya contains 9 of the 14 highest peaks in the world over 8,000m in height, including Mount Everest which is the high point of the Ganges basin. The other peaks over 8,000m in the basin are Kangchenjunga, Lhotse, Makalu, Cho Oyu, Dhaulagiri, Manaslu, Annapurna and Shishapangma. The Himalayan portion of the basin includes the south-eastern portion of the state of Himachal Pradesh, the entire state of Uttarakhand, the entire country of Nepal and the extreme north-western portion of the state of West Bengal.
  The discharge of the Ganges also differs by source. Frequently, discharge is described for the mouth of the Meghna River, thus combining the Ganges with the Brahmaputra and Meghna. This results in a total average annual discharge of about 38,000 m³/s (1,300,000 cu ft/s), or 42,470 m³/s (1,500,000 cu ft/s). In other cases the average annual discharges of the Ganges, Brahmaputra, and Me
caption: The river Ganges at Kolkata, with Howrah Bridge in the background
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