Question: 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? 
Sentence (from "Chestnut Hill Reservoir Historic District"): Most of the water works facilities are also located in Boston; the terminal house of the Sudbury Aqueduct, which is part of this district, is located just over the line in Newton.
Relevant evidence: No