NewcastleIrish An Caisleán Nuatown, Down district (established
1973), formerly in County Down, eastern Northern Ireland. It
lies along Dundrum Bay, at the foot of Slieve Donard (2,796 789
feet [852 m850 metres]), which is the highest peak in the Mourne
Mountains. The town is a popular seaside resort and tourist
centre for exploring the adjacent mountains. Nearby Tollymore
Forest Park (1,200 acres [486 hectares]) is a government
forestry estate and includes 135 species of trees. Light
engineering products are made in the town. The new castle, from
which the town takes its name, was a Magennis (MacGinnis)
stronghold, built in 1588. Pop. (19812001) 67,246444.