Castlereagh Lower
Castlereagh Lower is a historic barony in County Down, Northern Ireland. It was created by 1841 with the division of Castlereagh into two. The barony roughly matches the former Gaelic territory of Uí Blathmaic, anglicized Blathewic. It is bordered by three other baronies: Ards Lower to the east; Dufferin to the south; and Castlereagh Upper to the west and south-west. Castlereagh Lower is also bounded by Belfast Lough to the north and Strangford Lough to the south-east.