Today Jim embarks on his crossing of the wide open waters of Chesapeake Bay, by far the largest estuary with the most coastline of any other bay within our country. In fact, its 11,600 miles of shoreline is more than the entire coastline of the US. It drains 64,000 square miles across six states. And although it averages only 21 feet in depth, it has deep channels that run to 100 feet accommodating the passage of submarines and commercial traffic of every description along its 200 mile length. Its width varies from 4 miles at the Bay Bridge to 30 miles at the Potomac . It has more than 150 rivers and streams feeding it. On his way to the mouth of the Chesapeake yesterday, Jim passed Norfolk, VA including the Norfolk Naval Base and Fort Monroe, and experienced his first lock - the Great Bridge Lock. This is one of the most heavily trafficked areas of the Intracoastal Waterway (ICW). It is also considered the official end of the ICW that is known for its protected inland passageways. The ICW, however, unofficially continues up the Eastern Seaboard, with well charted protected and open waterways which Jim will follow to New York City. Though Jim has completed more than half of his1,400 mile row, like so many marathoners know, it's the last quarter of "the race" that is the most difficult, often referred to as the true halfway mark.