Final answer:
Gold mining pollution impacts the Amazon River and local ecosystems, affecting both the environment and human health.
Explanation:
The most polluted river in the Andean region is affected by gold mining activities that introduce toxic substances like cyanide and mercury into the water, particularly the Amazon River and its tributaries. This contamination impacts ecosystems and human health by entering the food chain and causing harm to both. The influx of miners has also led to social conflicts and environmental degradation in the area.
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