Chesapeake

Nearly 10,000 years ago, rising sea levels filled a meteor-impact crater to form the Chesapeake Bay, North America's largest estuary, and the world's third largest. The long tendrils of the Bay's watershed cover 64,000 square miles and span six states from Virginia to New York, holding 17 million people within its boundaries. There are more than 100,000 streams, creeks, or rivers in the watershed, including 150 major rivers, with names that conjure, such as the Susquehanna, Potomac, Shenand...