Lough Gill is a freshwater lough (lake) mainly situated in County Sligo, but partly in County Leitrim, in Ireland. Lough Gill provides the setting for William Butler Yeats' poem "The Lake Isle of Innisfree".

County Sligo is a county in Ireland. It is in the Northern and Western Region and is part of the province of Connacht. Sligo is the administrative capital and largest town in the county. Sligo County Council is the local authority for the county. The population of the county was 70,198 at the 2022 census. It is noted for Benbulben Mountain, one of Ireland's most distinctive natural landmarks.