The centrepiece of Northern Ireland's geography is Lough Neagh, at 151 square miles (391 km2) the largest freshwater lake both on the island of Ireland and in the British Isles. A second extensive lake system is centred on Lower and Upper Lough Erne in Fermanagh. The largest island of Northern Ireland is Rathlin, off the north Antrim coast. Strangford Lough is the largest inlet in the British Isles, covering 150 km2 (58 sq
freshwater lake both on the island