Sarandí Stream in Argentina
February 11 , 2025
77 days
342
- A stream on the outskirts of Buenos Aires, Argentina, has turned a striking crimson red.
- Experts suspect the presence of aniline, a toxic chemical used in dyes and the pharmaceuticals.
- The stream has changed colours multiple times before—gray, green, violet, blue, and brown—often with an oily surface.
- The Matanza-Riachuelo River basin has been called one of the most polluted waterways in Latin America.

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