This census-designated place first settled in 1623 is home to a defensive fortification built at the mouth of what river?
Kittery Point, Maine:  First settled in 1623, Kittery Point traces its history to the first seafarers who colonized the shore of what became Massachusetts Bay Colony and later the State of Maine. Kittery Point, Maine:  Located beside the Atlantic Ocean, it is home to Fort McClary State Historic Site, and Fort Foster Park on Gerrish Island. Fort McClary:  Built at the mouth of the Piscataqua River, it was used primarily throughout the 19th century to protect approaches to the harbor of Portsmouth, New Hampshire, and the U.S. naval shipyard.
i don't know