County Down, Northern Ireland brings together the granite heights of the Mourne Mountains and the softer edges of Strangford Lough and Dundrum Bay. Walk from Donard Forest toward Slieve Donard, follow the Meelmore and Meelbeg ridge, wander beneath towering trees in Tollymore Forest Park, or trade summits for sea air at Murlough National Nature Reserve and the long green corridor of the Lagan Towpath.