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I've always been curious (but never enough to deeply dig in) about why there is such an abrubt differential in tide heights once you swing around Cape Cod. The further north you go, the greater height in tides (Midway Island in the Pacific has a 1.5 foot tide differential). Newport works with a 3.5-4 foot tide yet Boston Harbor works 8-9 feet, even though they are with a hundred miles of each other and not that far in latitude. Now from Boston to Portland, ME - close to 150 miles, you gain only a foot. Why is it so sharp of an increase around the cape?
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