A sudden rise in the amount of salt in one of the longest rivers in Bangladesh is having a devastating effect on public health and the environment.
The Madhumati river flows for nearly 200km through the country's southwest.
This year, salinity in the Madhumati was measured at a concentration of 2,100 parts per million (ppm), the highest level in a decade.
Environmentalists warn if the saltwater intrusion continues at this rate, livelihoods, agriculture and the biodiversity of this region could be under serious threat.

Al Jazeera’s Tanvir Chowdhury reports from Tungipara, Bangladesh.

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