Londonderry | Northern Ireland, UK History & Culture | Britannica
https://www.britannica.com/place/Londonderry-former-county-Northern-Ireland
WEBLondonderry, former (until 1973) county, Northern Ireland. It was bounded by the Atlantic Ocean (north), the River Bann (east), former County Tyrone (south), and the River Foyle (west). It had an area of 801 square miles (2,075 square km), roughly triangular in shape. The former county’s principal.
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