Claim: Boston Harbor Islands National Recreation Area, a 1,482 acres (6.00 km) land located in Norfolk, Plymouth, and Suffolk counties, Massachusetts (the most populous state in the New England region of the northeastern United States), established on November 12, 1996.
Evidence: Norfolk, Plymouth, and Suffolk counties, Massachusetts Boston, Massachusetts 1,482 acres (6.00 km) November 12, 1996 Massachusetts (/ˌmæsəˈtʃuːsɪts/ (listen), /-zɪts/), officially known as the Commonwealth of Massachusetts, is the most populous state in the New England region of the northeastern United States.