Question: In which region is the town located where John Marlborough East's Neptune Studios?

Context paragraphs:
John Marlborough East: John Marlborough East (1860–1924) was a British stage and film actor.  He was an early film star who received over 3,000 votes in Picturegoer magazine's 1916 contest to establish the "Greatest British Film Player".  He was a founder of the Neptune Studios in Borehamwood which is today the site of Elstree Studios.  However, his career rapidly declined.  He made his final picture "Owd Bob" in 1924 and died the same year.

Pilot Bay, British Columbia: Pilot Bay is a ghost town located in the West Kootenay region of British Columbia.  The town is located west of Crawford Bay on the east side of Kootenay Lake, opposite the entrance to West Arm Provincial Park.  In the early 1890s, the Hendryx interests built a smelter on the east side of Kootenay Lake to treat the ores from their Blue Bell lead-silver mine at Riondel.  By 1895 the Pilot Bay Smelter was in operation with 200 men employed.  A town emerged around the smelter called Pilot Bay.  Pilot Bay had a population of 1,000 and had 4 hotels, 3 stores and some other businesses.  Mines which shipped their ore to the smelter include the Blue Bell, Ainsworth Mines, and Slocan Mines.  In 1896 the Hall Mines Smelter in Nelson had started and become too much competition for Pilot Bay.  This resulted in the closure of Pilot Bay Smelter in 1896.  The Pilot Bay Smelter reopened in 1905 but was eventually closed permanently.  Today all that is left is the ruins of the smelter and remnants of the town.

Tampines: Tampines (, Tamil: தெம்பினிஸ் ) is a planning area and residential town located in the East Region of Singapore.  The planning area is bordered by Bedok and Paya Lebar to the west, Pasir Ris to the north, Changi to the east and the Singapore Straits to the south.  Tampines New Town is located in the northern portion of Tampines planning area.  Tampines is the third largest new town in Singapore by area, covering over 2089 hectares of land and also is the third most populated new town, following Bedok and Jurong West.  It is the regional centre for the East Region.

Fort Marlborough: Fort Marlborough (Indonesian Benteng Marlborough, also known as Malabero) is an English fort located in Bengkulu City, Sumatra.  It was built between 1713-1719 by the East India Company under the leadership of Governor Joseph Collett as a defensive fort for the British East India Company's Residency there.  It was one of the strongest British forts in the eastern region, second only to Fort St. George in Madras, India.

Zincton, British Columbia: Zincton is a ghost town located in the West Kootenay region of British Columbia.  The town was located near Sandon, East of Slocan Lake.  The town of Zincton was built to support the mining efforts in the area.  Zincton was founded around 1892.  The ore predominantly found in the area was zinc.  Zinc was an unwanted metal at that time.  Much of the ore was shipped to the Pilot Bay smelter.  Zincton was destroyed by a forest fire in 1910.  In 1927 the Victoria Syndicate had acquired claims in the area and rebuilt the town.  The Kaslo and Slocan Railway line passed through Zincton.  Zincton was the largest producer of Zinc in the Slocan area.  The ore body was eventually depleted, and today Zincton is deserted.

Marlborough Benefice: The Marlborough Benefice is a group of parishes in and around the town of Marlborough, Wiltshire, England.  It consists of the parishes of St Mary's within the town, St George's Preshute (which also serves Manton) to the west, and St John the Baptist at Mildenhall (Minal) to the east.  The benefice is part of the Marlborough Deanery in the Diocese of Salisbury of the Church of England, which is part of the Christian, Anglican Communion.

Charia, Ghana: Charia is a small town located about five kilometres west of Wa, the capital of the Upper West Region of Ghana.  It has about ten thousand inhabitants.  The population comprises a mix of Christians, Muslims and Traditionalists.  The major economic activities of the town are; farming, pottery, commerce.  Since the country attained independence in 1957, the town has produced two District Commissioners for the Wa District (one in the Kwame Nkrumah Region and another during the John Evans Atta Mills presidency).  It has also produced a Deputy Minister under the John Agyekum Kufour administration.

Borehamwood: Borehamwood ( —originally spelt Boreham Wood), is a town in southern Hertfordshire.  It is a commuter town near Watford and London, situated 12 mi from Charing Cross.  Borehamwood has a population of 31,074, and is within the civil parish of Elstree and Borehamwood and the London commuter belt.  There is one weekly newspaper, the "Borehamwood and Elstree Times".  The town is perhaps most well known for its film and TV studios, commonly known as Elstree Studios, hence the association with Elstree.

Ada Kasseh: Kasseh is a town in the Ada East district, a district in the Greater Accra Region of Ghana.  It is a major town located between Sege and Sogakope on the Accra-Aflao road.  Kasseh has the biggest market in four districts(Ada West, Ada East, South Tongu and North Tongu) in its area.  Kasseh is connected to almost all the towns and villages in the Ada East district by road or path.  It is the most easily accessible town in the district.  It is connected by road to the district capital town of Ada Foah and the Town called Big Ada.

Willowdale, Pennsylvania: Willowdale is a small, unincorporated town located in East Marlborough Township, in southern Chester County, Pennsylvania.

Supporting paragraphs: John Marlborough East Borehamwood
Answer: southern Hertfordshire