Matanza River, River system in Buenos Aires Province, Argentina
The Matanza is a watercourse in Buenos Aires Province that stretches for 64 kilometers and changes its name to Riachuelo in the lower section near La Boca district. The riverbed crosses urban and industrial areas and finally flows into the Río de la Plata at the southern edge of the capital.
The river basin hosted numerous tanneries and slaughterhouses during the 19th and early 20th centuries, closely tied to Argentina's rising cattle industry. This industrial development shaped the banks permanently and led to massive water pollution that continues to the present day.
The name originates from 1536 when Spanish conquistadors suffered a defeat in the area, and it literally means slaughter. The naming still recalls this early and violent episode of colonial history along the riverbank.
The banks are unsuitable for recreational activities due to heavy pollution from industrial waste, so visitors should keep sufficient distance from the water. The southern area near La Boca however offers viewpoints from which you can watch the activity of river vessels.
The waters host carnivorous turtles that have adapted to extremely low oxygen levels and feed on birds instead of fish. This adaptation allowed the animals to survive in a habitat that remains uninhabitable for most other aquatic creatures.
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