The water levels of the Paraná River, the second-longest in South America after the Amazon, are at their lowest since 1944.
The river is pivotal to commercial shipping and fishing but also provides 40 million people with drinking water.
A drought in the region means water levels have dipped so low that fishers’ livelihoods are at risk.
Environmentalists fear that the drought has been made more severe by deforestation and climate change.
The Paraná is 3,032 miles long and flows south from south-east Brazil through Paraguay and Argentina.
It merges with the Paraguay and Uruguay rivers to form the Río de la Plata Basin.
Southern Brazil, where the Paraná’s source is located, has seen three years of below-average rainfalls.
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