Here is a map of the world's marine dead zones as of 2008: https://earthobservatory.nasa.gov/images/44677/aquatic-dead-zones https://earthobservatory.nasa.gov/

Here is a map of the world's marine dead zones as of 2008: https://earthobservatory.nasa.gov/images/44677/aquatic-dead-zones https://earthobservatory.nasa.gov/images/44677/aquatic-dead-...