Mountains and hills of Scotland near Ullapool and Stac Polly in Sutherland. The Torridonian rocks continue south to Applecross opposite Skye, where similar massive mountains occur. The Black Cuillin are mainly composed of basalt and gabbro, the latter being a very rough rock which makes for superb grip for mountaineers. It is from the dark colour of the gabbro that the Black Cuillin receive their name. The summits of the Cuillin are bare rock, jagged in outline and with steep cliffs and deep cut corries and gullies. The mountains exhibit many notable individual peaks and many exceed 1,000 metres (3,280 ft) in height, so qualifying
Cheviot Hills they are separated from the Cheviot Hills by the Tyne Gap, part of which lies within the southern extent of the Northumberland National Park. The Cheviot Hills are primarily associated with geological activity from approximately 480 to 360 million years ago, when the continents of Avalonia and Laurentia collided, resulting in extensive volcanic activity (the Caledonian orogeny) which created a granite outcrop surrounded by lava flows. The area enjoys a general right to roam under both the English Countryside and Rights of Way Act 2000 and the Scottish Land Reform (Scotland) Act 2003. The Southern Cheviots include the Otterburn Training