The Ganges

Where it is

The Ganges rises in the western Himalaya and runs roughly south-east across the northern Indian plain, gathering very large tributaries — the Yamuna, the Ghaghara, the Gandak, the Kosi — before joining the Brahmaputra in Bangladesh and reaching the Bay of Bengal through the largest delta on Earth. The plain it crosses is flat, deep in alluvium, and among the most densely populated agricultural regions anywhere. Its flow is strongly seasonal: most of the year's water arrives with the summer monsoon, with Himalayan snow and ice contributing more in the dry months than the annual totals suggest.

The land and water around it

• The Gangetic plainbasin

  A vast, almost flat alluvial plain built by the river and its tributaries. Its gradient is so slight that the channels wander, which is why settlement patterns here are inseparable from where the water was last century.

• The Bengal Deltadelta

  Where the Ganges and Brahmaputra meet the sea, across Bangladesh and West Bengal. Sediment supply, freshwater flow and tidal salinity all meet here, and all three are affected by decisions taken hundreds of kilometres upstream.

• The Sundarbansforest

  The mangrove forest at the delta's seaward edge, straddling the India–Bangladesh border. It buffers storm surge and depends on a particular balance of fresh and salt water.

Its history, in short

The river has been the axis of northern Indian settlement, agriculture and religious practice for millennia, with cities strung along it and pilgrimage organised around specific points on its banks. Its modern history is a history of engineering: canal systems from the nineteenth century, barrages that divert flow between distributaries, and cleaning programmes since 1986 that have repeatedly been relaunched. The two are connected — the same works that made the plain more productive also changed what the river could carry away.

Timeline

Dates are shown on a timeline rather than as changing shapes on the map. The globe draws modern boundaries only, and tinting a modern outline to stand for a historical one would state something we cannot source.

Places that carry meaning

• VaranasiFirst millennium BCE onward

  On the river's high outer bank at a bend where it briefly runs north. Its ghats are stepped access to water whose level changes by metres between seasons, and cremation grounds sit directly on the water.

• HaridwarLong-standing practice

  Where the river leaves the mountains for the plain, and a major pilgrimage point. The Ganges Canal takes its water from here, so the same location is both a religious threshold and a hydraulic one.

Learn the language here

1. 1Understand which languages are spoken hereThe Ganges is multilingual. Start with which languages are used, by whom, and for what — the phrase list only covers one of them.Written by Globe Quest

Check yourself

• Why does Himalayan ice matter more than its share of annual flow suggests?

  Because it contributes disproportionately in the dry season, when there is least other water

  Annual totals are dominated by the monsoon, but dry-season flow is when the marginal contribution matters most.

• Why has cleaning the river proved so hard?

  Because capacity, maintenance, dispersed industry and split jurisdiction all bind at once

  It is a governance problem wearing an engineering costume — building plants is the part that was solved.

Worth arguing about

• A river that is sacred, a water supply and a drain at the same time. When those uses conflict, whose claim should win?
• Farakka helps Kolkata and reduces Bangladesh's dry-season flow. What principle should govern a river that crosses a border?

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