In which Northern Ireland county are the Mourne Mountains, which contain the highest NI peak Slieve Donard?
Slieve Donard the summit commemorates him. Slieve Donard Slieve Donard ( ; ) is the highest mountain in Northern Ireland and the wider province of Ulster, with a height of . One of the Mourne Mountains, it is near the town of Newcastle on the eastern coast of County Down, overlooking the Irish Sea. It is also the 7th highest peak on the island of Ireland. The Mourne Wall – built in the early 20th century – runs up the western and southern slopes of the mountain, joining a small stone tower at the summit. Also on the summit are the remains
Slieve Donard Mournes, overlooking Newcastle and Dundrum Bay. It has two lesser summits on the seaward side – Millstone Mountain (460 m), and Crossone (540 m). Two glens separate Slieve Donard from the neighbouring mountains of Slieve Commedagh (to the northwest) and Chimney Rock Mountain or Slieve Neir (to the south). Slieve Commedagh, at , is the second-highest of the Mourne Mountains. The mountain is an easy climb although the path is very eroded at places. The most popular route begins at Slieve Donard Forest on the north side of the mountain and follows the Glen River and then the Mourne Wall