County Londonderry, also known as County Derry, is one of the six counties of Northern Ireland, one of the thirty two counties of Ireland and one of the nine counties of Ulster. Before the partition of Ireland, it was one of the counties of the Kingdom of Ireland from 1613 onward and then of the United Kingdom after the Acts of Union 1800. Adjoining the north-west shore of Lough Neagh, the county covers an area of 2,118 km2 and today has a population of about 247,132.
Since 1972, the counties in Northern Ireland, including Londonderry, have no longer been used by the state as part of the local administration. Following further reforms in 2015, the area is now governed under three different districts; Derry and Strabane, Causeway Coast and Glens and Mid-Ulster. Despite no longer being used for local government and administrative purposes, it is sometimes used in a cultural context in All-Ireland sporting and cultural events.
Wikipedia https://en.wikipedia.org/wiki/County_Londonderry
Coordinates 54°55'45.55" N -6°50'49.152" E
