The Chesapeake Bay is the largest estuary in the United States. It is about 200 miles long. At the Bay Bridge near Annapolis, it is only 4 miles across, but it is 30 miles across at the widest point near the mouth of the Potomac River. The Bay watershed drains 64,000 square miles of land in six states- Maryland, Virginia, Delaware, Pennsylvania, West Virginia and New York and Washington, D.C. To give some idea of the size, the Bay watershed is about 5 times bigger than state of Maryland and 30 times larger than Delaware, yet it is only one-fourth the size of Texas!
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