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