What do Cooperstown, New York; Harrisburg, Pennsylvania; Berkeley Springs, West Virginia; Annapolis, Maryland; and Richmond, Virginia, have in common_ They are all part of the Chesapeake Bay watershed—America's largest and most productive estuary. The Chesapeake Bay watershed covers an area of 64,000 square miles.

The watershed includes parts of six states—Maryland, West Virginia, Virginia, Delaware, Pennsylvania, and New York—and the entire District of Columbia.

The Bay is the heart of the watershed, and the thousands of miles of streams, rivers and wetlands are its circulatory system. Thousands of plant and animal species and more than 15 million people live within the Chesapeake Bay watershed. The human population in the watershed has significantly affected the Watershed's habitats, water quality and resources. Tune in daily to Watershed Radio to learn more about natural processes and human activities in the watershed.

More maps:

Watershed Radio's story on Watershed Geology has a geology map of the watershed, showing the five main physiographic provinces in the watershed, and watershed Radio's Satellite Maps explains how scientists use maps to analyze land use in the watershed.