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Boston Harbor Islands National Recreation Area Minutes Away. Worlds Apart.
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Boston Harbor Islands National Recreation Area
Island Facts
 
 
The sizes of the islands in the park change every hour, as the ocean tides ebb and flow on their shores. All totaled, the park islands change from 1,483 to 3,067 acres during the tidal cycle. Learn how island acreage was measured, considering daily tides.

The names of several islands have also changed over time. How we selected the spelling of island names, and alternate names for some islands, are described in, "What's in a name?"

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Last Updated: July 20, 2011 at 09:47 MST