Journey
Rivers that moved
Indian rivers are not fixed lines on a map and never have been. Eight of them here abandoned their beds, and each time a city, a trade route or a whole province went with the water. Where the science is still unsettled, this says so rather than choosing the tidier story.
Stops (9)
- Ghaggar–Hakra palaeochannel · before the mature Harappan
A major relict channel with Indus settlements strung along it, often identified with the Vedic Sarasvati. Sediment dating near Kalibangan indicates the Himalayan Sutlej had already abandoned this course long before the mature Harappan cities, so the channel the sites sit on was probably monsoon-fed rather than glacier-fed. That changes what the abandonment of these towns has to be explained by.
- Indus basin · continuous
The Indus and its tributaries preserve abandoned channels and avulsion scars across the whole floodplain. Aror, Brahmanabad, Banbhore and Thatta were each in turn left by the river. Reading these as a mobile system, rather than assuming a fixed network, is what stops ancient settlement positions being misread as deliberate choices.
- The Ganges' eastward migration · 16th–18th century
The main discharge of the Ganges moved from the Bhagirathi-Hooghly in the west to the Padma in the east. Gaur, Pandua, Rajmahal, Murshidabad and Tamralipta were all stranded in the same period and for the same reason, while the active delta and the rice frontier moved into what is now Bangladesh.
- Tista · 1787
In the floods of that year the Tista abandoned its old channels toward the Ganges and cut a new course south-east into the Brahmaputra. It is the best-documented single river capture in South Asia, recorded as it happened in Company survey and revenue papers, with Rennell's atlas of 1781 showing the earlier arrangement.
- Brahmaputra braid & 1950 quake · 1950 and after
The Brahmaputra runs in a braid plain up to fifteen kilometres wide and carries one of the heaviest sediment loads of any river. The magnitude 8.6 earthquake of August 1950 raised its bed sharply, and Assam's flooding and bank erosion since are measured in square kilometres of land lost a year.
- Majuli · the island that is going
The largest island in the Brahmaputra, whose satras are monasteries, art schools and dispute-resolution bodies at once. It has lost more than half its area since the nineteenth century, and individual satras have been physically dismantled and rebuilt further inland as the bank retreated. Individual satras have been dismantled and rebuilt further inland as the bank retreated, some of them more than once, and the island has gone from roughly twelve hundred square kilometres to under five hundred.
- Kosi river avulsion landscape · 1731 and after
The Kosi has swung roughly a hundred and twenty kilometres west across its own megafan in two and a half centuries, which is why north Bihar is called its curse. The embankments built from 1955 raised the bed inside them; the 2008 breach at Kusaha put the river back into an eighteenth-century channel and displaced three million people.
- Damodar · 1943 and after
The Damodar's floods earned it the name Sorrow of Bengal, and the Damodar Valley Corporation of 1948 was independent India's first multipurpose river project, modelled explicitly on the Tennessee Valley Authority. Coalfields, dams and a silting reservoir system now sit on a river that was chiefly a flood problem. The reservoirs have since silted faster than they were designed to.
- Derawar Fort · the Hakra's bed
Derawar's forty bastions stand on the dry bed of the Hakra in Cholistan, along the same palaeochannel as Ganweriwala, one of the five largest Harappan cities and still undug. A ninth-century desert fort and a Bronze Age city mark the course of a river that has not run for four thousand years, which is why both now sit in the middle of sand.