County Londonderry, also known as County Derry (Irish: Contae Dhoire, Ulster Scots: Coontie Lunnonderrie), is one of the six counties of Northern Ireland. Adjoining the north-west shore of Lough Neagh, the county covers an area of 2,074 km² and has a population of about 247,132. It is also one of the thirty-two traditional counties of Ireland, lying within the historic province of Ulster.
Since 1981, it has become one of four counties in Northern Ireland that has a Catholic majority (55.56% according to the 2001 Census), with 57% of the Catholic population residing within Derry City Council. The county flower is the Purple Saxifrage. The term Oak Leaf County is the county nickname particularly in relation to the county's teams in GAA competitions.