The Fisher Hill Reservoir and Gatehouse are a historic element of the public water supply for which metropolitan region of New England encompassing the municipality of Boston, the capital of the US state of Massachusetts, and the most populous city in New England, as well as its surrounding areas? 
Greater Boston: Greater Boston is the metropolitan region of New England encompassing the municipality of Boston, the capital of the US state of Massachusetts, and the most populous city in New England, as well as its surrounding areas.
i don't know