County Derry (or County Londonderry) is one of the traditional counties of Ireland. It is located within the province of Ulster and is part of Northern Ireland. It was named after its main town – and later city and administrative centre – Derry , which lies in the north-western corner of the county. It is one of four counties in Northern Ireland which presently has a majority of the population from a Catholic community background, according to the 2001 census.
The highest point in the county is the summit of Sawel Mountain (678m) on the border with County Tyrone. Sawel is part of the Sperrin Mountains, which dominate the southern part of the county. To the east and west, the land falls into the valleys of the Bann and Foyle rivers respectively; in the south-east, the county touches the shore of Lough Neagh, which is the largest lake in Ireland; the north of the county is distinguished by the steep cliffs, dune systems and remarkable beaches of the Atlantic coast.
Derry is mainly a hilly county, with scenic hills, glens and river valleys. To the south the Sperrin mountains, culminating in Sawel (2,240 feet), mass along the border with County Tyrone; in the north is the Atlantic coast, fringed with magnificent beaches of surf-washed sand. Derry city, on a commanding hill overlooking a broad tidal curve of the River Foyle, is an ancient and historic town. On the northern coast are the seaside resorts of Portstewart and Castlerock, and throughout the county there are numerous tourist attractions.