Question: Which lake in Northern Ireland is near the Ballyscullion House and supplies 40% of Northern Ireland's water?

full_context: Document 1: Lugton Water: The Lugton Water, the largest tributary of the River Garnock, runs 14 mi from Loch Libo (395 feet above sea-level) in Uplawmoor, through Lugton and the parishes of Neilston, Beith, Dunlop, Stewarton and Kilwinning. The Lugton joins the Garnock below the tidal limit, shortly after passing through Eglinton Country Park, developed around the ancient estate of the Earl of Eglinton.
Document 2: Lough Neagh: Lough Neagh (pronounced , ) is a large freshwater lake in Northern Ireland. It is the largest lake by area in the British Isles, with a surface area of 392 km2 . It supplies 40% of Northern Ireland's water. Its main inflows are the Upper River Bann and River Blackwater, and its main outflow is the Lower River Bann. Its name comes from Irish: "Loch nEachach" , meaning "Eachaidh's lake" (] ). The lough is owned by the Earl of Shaftesbury.
Document 3: Ballycastle McQuillan GAC: McQuillan GAC Ballycastle (Irish: MacUílín CLG Baile an Chaisleáin) is a Gaelic Athletic Association club located in the town of Ballycastle in County Antrim, Northern Ireland. The club is affiliated with the Antrim county board. The club participates in both hurling and Gaelic football but is known primarily for its hurling successes. They play their home matches at Páirc Mac Uílín which has also hosted the Antrim Senior Hurlers in recent years due to the ongoing redevelopment of Casement Park. The Senior Hurling team is sponsored by Waste Not Ireland and the Senior Gaelic Football team is sponsored by McCurdy Surveying. Both are local businesses in the town.
Document 4: Llyn Brenig: Llyn Brenig is a reservoir located in Wales, in the heart of the Denbigh Moors, at a height of 1200 feet, on the border between the counties of Conwy and Denbighshire. It is used to manage the flow in the River Dee as part of the River Dee regulation system which is designed to protect the water supply for North West England and north-east Wales, particularly Liverpool and its surrounding area.
Document 5: Ulster: Ulster ( ; Irish: "Ulaidh" ] or "Cúige Uladh" ] , Ulster Scots: "Ulstèr" or "Ulster") is a province in the north of the island of Ireland. It is made up of nine counties, six of which are in Northern Ireland (a part of the United Kingdom) and three of which are in the Republic of Ireland. It is the second largest and second most populous of Ireland's four provinces, with Belfast being its biggest city. Unlike the other provinces, Ulster has a high percentage of Protestants. Those of Catholic background make up about 51% of its population while those of Ulster Protestant background make up about 43%. English is the main language and Ulster English the main dialect. A minority also speak Irish, and there is a Gaeltacht (Irish-speaking region) in the west of Ulster. Lough Neagh, in the east, is the largest lake in the British Isles, while Lough Erne in the west is one of its largest lake networks. The main mountain ranges are the Mournes, Sperrins, Croaghgorms and Derryveagh Mountains.
Document 6: Ballyscullion House: Ballyscullion House refers to two country houses built for the Hervey family near Bellaghy in County Londonderry, Northern Ireland, close to Lough Beg at north-west corner of Lough Neagh.
Document 7: Lissan House: Lissan House is a historic house and tourist attraction in Northern Ireland. Lissan lies nestled at the foot of the Sperrin Mountains amid ancient woodland near the historic market town of Cookstown.
Document 8: Laghy: Laghey or Laghy () is a small village in County Donegal, Ireland, between Ballintra and Donegal Town. Laghey is one of three villages that make up the parish of Drumholm, formerly a civil and Church of Ireland parish, now only used as a division of the Roman Catholic Diocese of Raphoe. The village has a quarry, a supermarket, garden centre, filling station, two public houses, a church with a graveyard, an Orange hall, a recycling centre, a Donegal County Council yard and salt depot, and a national school (St Eunan's NS). Laghey is also near two of the most scenic beaches in Ireland, namely Rossnowlagh and Murvagh. Murvagh is also the home to the Donegal Golf Club.
Document 9: Ballylough Castle: Ballylough Castle is a ruined castle in County Antrim, Northern Ireland, that was a stronghold of the MacQuillans and the MacDonnells in former times.
Document 10: Loch Ness: Loch Ness ( ; Scottish Gaelic: "Loch Nis" ] ) is a large, deep, freshwater loch in the Scottish Highlands extending for approximately 37 km southwest of Inverness. Its surface is 52 ft above sea level. Loch Ness is best known for alleged sightings of the cryptozoological Loch Ness Monster, also known affectionately as "Nessie". It is connected at the southern end by the River Oich and a section of the Caledonian Canal to Loch Oich. At the northern end there is the Bona Narrows which opens out into Loch Dochfour, which feeds the River Ness and a further section of canal to Inverness. It is one of a series of interconnected, murky bodies of water in Scotland; its water visibility is exceptionally low due to a high peat content in the surrounding soil.
Document 11: Dunaneeny Castle: Dunaneeny Castle (or "Dunineny Castle", Irish "Dún an Aonaigh") is a ruined castle near Ballycastle, Antrim, Northern Ireland. The castle was home to the chiefs of Clan MacDonald of Dunnyveg and later the MacDonnells of Antrim.
Document 12: Silent Valley Reservoir: The Silent Valley Reservoir is a reservoir located in the Mourne Mountains near Kilkeel, County Down in Northern Ireland. It supplies most of the water for County Down, surrounding counties and most of Belfast. It is owned and maintained by Northern Ireland Water Limited (formerly DRD Water Service). The reservoir was built between 1923 and 1933 by a workforce of over one thousand men, nine of whom died.
Document 13: Bala Lake: Bala Lake (] ; Welsh: "Llyn Tegid" , ] ; its correct name, being Llyn Tegid in Welsh) is a lake in Gwynedd, Wales. The name Tegid may be related to Welsh "teg", meaning "fair". It was the largest natural body of water in Wales before its level was raised by Thomas Telford to help support the flow of the Ellesmere Canal. It is 3.7 mi long by 0.5 mi wide, and is subject to sudden and dangerous floods. The River Dee runs through it and the waters of the lake are famously deep and clear. The town of Bala sits at its north-eastern end and the narrow gauge Bala Lake Railway runs for 3 mi along the lake's south-eastern shore, and continues south-westward to the village of Llanuwchllyn (whose name means "church ['llan'] above ['uwch'] the lake ['llyn'").
Document 14: Roughan Castle: Roughan Castle is a castle a mile outside Newmills, County Tyrone, Northern Ireland, on the Dungannon to Stewartstown road. It was built about 1618 by Sir Andrew Stewart (d.1639), 2nd Lord Castlestewart, eldest son of Andrew Stewart (1580-1629) the third Lord Ochiltree, 1st Lord Castlestewart who came from Scotland during the plantation and established the nearby town of Stewartstown. Andrew Stewart junior acquired the land of Ballokevan from Robert Stewart between 1610 and 1619 and built his castle overlooking Roughan Lough. It is a small square castle, three storeys high with a central tower 20 ft square, flanked by thick rounded towers at each corner.
Document 15: Beagh (Spiritual): Beagh (Spiritual) is a townland lying within the civil parish of Maghera, County Londonderry, Northern Ireland. It lies in the south of the parish on the north boundary of the civil parish of Termoneeny, and is bounded by the townlands of Carricknakielt, Curragh, Maghera civil parish~Curragh, Knocknakielt, Slaghtybogy, and Tamnymartin. It wasn't apportioned to any of the London livery companies, being kept as church lands.
ground_truth: Lough Neagh