San Francisco Chronicle reports 95,000 sq mi. The oceans cover 129,443,837 sq mi so that would be less than a tenth of one percent of the total area.
Also, there are a total of 150 counted dead zones, each one ranging in size from under a square mile to over 45,000 sq mi, and it is projected to expand at a frightening pace unless action is taken.
As of 2008, 405 dead zones were counted in the world. The largest was 27,000 square miles. Examples in the US are the northern Gulf of Mexico region, coastal regions of the Pacific Northwest, and the Elizabeth River.
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