Large swathes of South Sudan have been under water for several years after unprecedented flooding, which scientists say has been worsened by climate change.
In recent years, these climate-driven floods have mixed with oil.
South Sudan is the world’s youngest country and one of its poorest, with a government hugely dependent on oil revenue.
Health professionals and politicians in the area have told the BBC they fear pollution and the lack of clean water are taking a toll on human health.
The BBC asked the oil consortium GPOC and the South Sudanese president’s office to comment on the allegations in this report, but they did not respond.
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