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? 
Context: 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.  The region forms the northern arc of the US northeast megalopolis and as such, Greater Boston can be described as either a metropolitan statistical area (MSA), or as a broader combined statistical area (CSA).  The MSA consists of most of the eastern third of Massachusetts, excluding the South Coast region and Cape Cod; while the CSA additionally includes the municipalities of Manchester (the largest city in the US state of New Hampshire), Providence (the capital and largest city of the US state of Rhode Island), Worcester, Massachusetts (the second largest city in New England), as well as the South Coast region and Cape Cod in Massachusetts. The Framingham Reservoir No. 1 Dam and Gatehouse are a historic water works facility in Framingham, Massachusetts.  They are located at the end of Framingham Reservoir No. 1, which is also known as the Stearns Reservoir, off Winter Street and north of Long Avenue.  They were constructed 1876-78 as part of an expansion of the water supply of the city of Boston and were designed by its first city architect George A. Clough.  The historical purpose of the reservoir, which was located at the confluence of two branches of the Sudbury River, was primarily to control the river's water level, and secondarily to provide reserve supply capacity.  The reservoir's reserve capacity was generally used only as a backup supply as the reservoir's muddy bottom made it a less desirable source than reservoir 3 upstream.  However the reservoir no. 1 system was nonetheless important due to its role in controlling the flow of the river downstream and due to the gatehouse which controlled the water flows for all the Framingham reservoirs into the Sudbury Aqueduct.  Reservoir No. 1 is no longer maintained as a reserve water source, although it is still owned by the Massachusetts Water Resources Authority, successor to the Boston Water Board which oversaw its construction.  MWRA retains ownership as the gatehouse contains the connection between Reservoir No. 3 and the Sudbury Aqueudct which remain part of the emergency water systems. The High Service Water Tower and Reservoir are a public water supply facility off Massachusetts Route 110 in Tower Hill, Lawrence, Massachusetts.  The reservoir was constructed in 1874-75 to provide the city's public water supply, with a gatehouse designed by Charles T. Emerson, a Lawrence architect.  The tower was built in 1896 as a high pressure standpipe or water tower.  The tower stands 157 ft high, and is built out of red brick with granite trim.  It is Romanesque in its style, and was designed by George G. Adams, a noted local architect who had been taught by Emerson.  The standpipe inside the tower is of steel construction and is 102 ft in height.  The area above the standpipe includes a balcony capped by a chateauesque roof, with round-arch windows providing views of the area.  The main tower is octagonal in shape, with a narrow round staircase tower projection from one side. Chestnut Hill Reservoir is a reservoir created in 1870 on existing marshes and meadowland to supplement the city of Boston's water needs.  It is surrounded by Chestnut Hill, a neighborhood which consists of parts of Boston, Brookline, and Newton.  The reservoir, though, is located entirely within the city limits of Boston.  A 1.56 mile jogging loop abuts the reservoir.  Chestnut Hill Reservoir was taken offline in 1978 as it was no longer needed for regular water supply distribution, but is maintained in emergency backup status.  It is recognized today on the National Register of Historic Places and it has designation as a City of Boston Landmark. The Sudbury Aqueduct is an aqueduct in Massachusetts.  It runs for 16 mi from Farm Pond at Waverly Street in Framingham to Chestnut Hill Reservoir in Boston.  A later built extension main runs from the Farm Pond gatehouse to the gatehouse at the Stearns Reservoir (Framingham Reservoir #1) where additional mains connect to the Brackett and Foss Reservoirs (Framingham #2 and #3.)  Going east from Framingham, it runs through Sherborn before entering Natick.  From Natick it runs east through Wellesley and Needham to the Charles River, which it crosses on the Echo Bridge into Newton.  It ends at the Chestnut Hill Reservoir on the Newton side of the Newton-Boston line.  The Massachusetts Water Resources Authority (MWRA) operates the aqueduct. The Framingham Reservoir No. 2 Dam and Gatehouse is a historic water works facility in Framingham, Massachusetts.  The dam and gatehouse are located west of the junction of Winter and Fountain Streets, and impound a branch of the Sudbury River.  The reservoir, which is also known as the Brackett Reservoir, was built 1877-79 as part of an expansion of the water supply of the city of Boston.  The dam is 1376 ft in length, with a centered overfall area.  The core of the dam is granite rubble laid in cement, with earthen embankments.  The overfall area is faced on the downstream side with cut granite, and earthen embankment on the upstream side.  It is topped with granite and originally had iron mounts for flashboards.  The gatehouse is a rectangular granite structure with a steep hip roof, a brick chimney and an eyebrow dormer.  The door and windows are in round-arch openings.  It contains gate controls for regulating water flow from the reservoir and from a 4 ft pipe connected to Reservoir No. 1, and a 2 ft pipe connected to the Ashland Reservoir. Bellevue Standpipe is a historic water storage tank on Bellevue Hill at Washington Street and West Roxbury Parkway in the Stony Brook Reservation of Boston, Massachusetts.  The masonry structure is 114 ft tall and 47 ft in diameter, built out of rough-cut granite blocks.  It was built by the Metropolitan Water and Sewerage Board (predecessor to today's MWRA) in 1914 to house a 2.5 million gallon steel water storage tank, as part of the Southern Extra High Service Area.  It received water from the Fisher Hill Reservoir in Brookline via a 20-inch main.  A second water storage tank was added at this location in 1955-56. The Chestnut Hill Reservoir Historic District is a historic district encompassing the Chestnut Hill Reservoir and the surrounding water works facilities which were historically used to provide fresh water to Boston, Massachusetts, and surrounding towns.  The district is nearly coextensive with the Chestnut Hill Reservation, a state park managed by the Massachusetts Department of Conservation and Recreation (DCR); those elements of the water works that are still required as an emergency backup are managed by the Massachusetts Water Resources Authority (MWRA).  The reservoir is located between Beacon Street and Commonwealth Avenue in Boston, just east of the Boston College Main Campus Historic District and the Boston-Newton city line.  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. The Framingham Reservoir No. 3 Dam and Gatehouse is a historic waterworks facility in Framingham, Massachusetts.  The dam and gatehouse are located at the southeastern end of Framingham Reservoir No. 3, off Massachusetts Route 9.  They were built 1876–78 as part of an expansion of the public water supply of the city of Boston.  The dam is 2280 ft long, and impounds an area of 253 acre in the Sudbury River watershed.  The reservoir is the largest of the three Framingham reservoirs that were built at that time.  The dam's core is constructed of granite rubble laid in cement.  There is a granite-lined overfall area 100 ft long, which was originally topped by flashboards.  At the end of the overfall area nearest Route 9 stands the gatehouse, a granite structure with a rectangular main block and a smaller wing.  Both sections have a steeply pitched slate roof.  The door is in a round-arch recess, and the building is capped by a cupola.  It houses controls for two 4 ft mains connected to the Sudbury Aqueduct via the gatehouse at Reservoir No. 1.  The water is directed either directly beyond the dam into reservoir 1 or through the 4-foot mains to the Sudbury Aqueduct gatehouse. The Fisher Hill Reservoir and Gatehouse are a historic element of the public water supply for the Greater Boston area.  The reservoir was located on Fisher Road between Hyslop and Channing Roads in Brookline, Massachusetts, and is now the site of Fisher Hill Reservoir Park.  It was built in 1886-87 as an early component of the Boston Water Board's expansion of its high service system.  The gatehouse may have been designed by Arthur Vinal, who also designed the high pumping station at Chestnut Hill Reservoir.  It is a two-story Richardsonian Romanesque structure, with its first floor finished in stone and its second in brick.  Brownstone trim is used on the windows and corner quoins, and the voussoirs which form the arches on the first floor.  There are pipes to the reservoir and down to Chestnut Hill, and gates for controlling access to local the distribution network.  The building was taken out of service in the 1950s.
Answer: Greater Boston