The Mourne Mountains (pronounced /ˈmɔərn/ MOHRN; Irish: na Beanna Boirche), also called the Mournes or Mountains of Mourne, are a granite mountain range in County Down in the south-east of Northern Ireland. It includes the highest mountains in Northern Ireland and the province of Ulster. The highest of these is Slieve Donard at 850 m (2,790 ft). The Mournes is an Area of Outstanding Natural Beauty and has been proposed as the first national park in Northern Ireland. The area is partly owned by the National Trust and sees a large number of visitors every year. The name Mourne (historically spelt Morne) is derived from the name of a Gaelic clann or sept called the Múghdhorna.