• Lush vegetation on the top of Spectacle Island's North drumlin dominates the foreground. Boston's skyline can be seen in the distance.  The park's logo with tag line minutes away, worlds apart empashises the stark contrast between the city and islands.

    Boston Harbor Islands

    National Recreation Area Massachusetts

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?"

 
 
 

Did You Know?

Satellite Imagery of Boston Harbor Seafloor and Islands

Boston Harbor Islands is one of 14 national park that has the word "islands" in the name. Other island parks include Channel Islands in California, Apostle Islands in Wisconsin, Governors Island in New York and Assateague Island in Maryland.