Question: Which lake in Northern Ireland is near the Ballyscullion House and supplies 40% of Northern Ireland's water?
Sentence (from "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.
Relevant evidence: Yes