Within the United Kingdom , it is surpassed only by Lough Neagh and Lower Lough Erne in Northern Ireland and regarding the British Isles as a whole there are also several larger loughs in the Republic of Ireland .
Within the United Kingdom , it is surpassed only by Lough Neagh and Lower Lough Erne in Northern Ireland . In the British Isles as a whole there are several larger loughs in the Republic of Ireland .