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How hypoxia works graphic

What's hypoxia? What's eutrophication? Learn about what causes an area in the northern Gulf of Mexico to have oxygen levels in the water that are low enough to harm marine life.

Northern Gulf of Mexico hypoxia extent 2010

Raising awareness about hypoxia: access information in online articles and TV news.

Map of the Mississippi Atchafalaya River Basin

Learn about the Mississippi-Atchafalaya River Basin (MARB), a vast watershed that comprises parts or all of 31 states.

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This page is maintained by the U.S. EPA Office of Wetlands, Oceans, and Watersheds,
1200 Pennsylvania Avenue, N.W. (4504T) Washington, DC 20460.