The river-named tug Wicomico pushes a load down Chesapeake Bay , America’s largest estuary, bound for Hampton Roads and the city of Chesapeake, Va. The main shipping channel that runs for the length of the bay is actually the ancient bed of the Susquehanna River, with origins in New York and Pennsylvania, and dates from a time when earth was much colder and the sea level much lower than it is now.
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