It's where the 3 mile state territorial waters end and the waters under federal jusrisdiction being. In most places it begins 3 miles from the shoreline and ends at the 200 mile limit. But, there are places where it bulges to include offshore islands in state waters, like Nantucket. If you're more than 3 miles offshore, you can't really know for sure whether you're in the EEZ without a chart.
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