Map of the <a href="https://en.wikipedia.org/wiki/Chesapeake_Bay" class="extiw" title="w:Chesapeake Bay">w:Chesapeake Bay</a> <a href="https://en.wikipedia.org/wiki/drainage_basin" class="extiw" title="w:drainage basin">watershed</a>.
<a href="https://en.wikipedia.org/wiki/United_States_Geological_Survey" class="extiw" title="w:United States Geological Survey">U.S. Geological Survey</a>
From the <a href="https://en.wikipedia.org/wiki/United_States_Geological_Survey" class="extiw" title="w:United States Geological Survey">U.S. Geological Survey</a> report <i>Status and Trends of the Nation's Biological Resources</i> <a rel="nofollow" class="external autonumber" href="https://biology.usgs.gov/s+t/SNT/index.htm">[1]</a>, specifically the chapter "Trends in the Chesapeake Bay Watershed Wetlands"<a rel="nofollow" class="external autonumber" href="https://biology.usgs.gov/s+t/SNT/noframe/ne124.htm">[2]</a>.