The Sycamore Gap Tree is by Hadrian's Wall, between Milecastle 39 and Crag Lough, about 3 kilometres (1.9 mi) west of Housesteads Roman Fort in Northumberland, Northern England. This section of the wall follows the edge of a cliff – an outcrop of the Whin Sill – and several sharp dips in it caused by melting glacial waters. The tree stands within one of these dips with the cliff and wall rising dramatically either side of it. The wall and adjacent land, including the site of the tree, are owned by the National Trust. A popular tourist attraction, the tree is described as one of the most photographed in the country and the location may be the most photographed point in all of Northumberland National Park. It is visible from the nearby B6318 Military Road. The name "Sycamore Gap" was coined by a National Trust employee when the Ordnance Survey were remapping the area and asked if the previously unnamed spot had a designation.