(Shamelessly “borrowed” from Wikipedia: https://en.wikipedia.org/wiki/Cheviot_Hills)
The Cheviot Hills, or sometimes The Cheviots, are a range of uplands straddling the Anglo-Scottish border between Northumberland and the Scottish Borders. The English section is within the Northumberland National Park. The range includes The Cheviot (the highest hill), plus Hedgehope Hill to the east, Windy Gyle to the west, and Cushat Law and Bloodybush Edge to the south.
The hills are sometimes considered a part of the Southern Uplands of Scotland as they adjoin the uplands to the north. Since the Pennine Way runs through the region, the hills are also considered a part of the northern Pennines although 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.
Most of the range on the English side is mapped as ‘open country’ and hence there is a general right to roam over it as prescribed in the Countryside and Rights of Way Act 2000. Traditional rights of access in Scotland, bolstered by the Land Reform (Scotland) Act 2003, provide for similar access for the public to the north of the border. In addition, a sparse network of public bridleways and footpaths stretches around the area, often providing useful means of access from the lower ground onto the open hills.
The northernmost leg of the Pennine Way runs from Byrness in England to Kirk Yetholm in Scotland. It is the longest, and most exposed, on the whole of the national trail. The Way follows the high level Border Ridge (literally the England–Scotland boundary fence) for nearly 20 miles (32 km) after the ascent to the ridge from Byrness. The terrain is boggy and remote, and two mountain refuge huts are situated on the Way for those too tired or weather-beaten to continue.
The town of Wooler in the Cheviot Fringe (the lowlands bordering the hills to the east) is often cited as the “Gateway to the Cheviots” as it is the largest town in the Cheviot region; the town also has easy access being on the major A697 road.
The Southern Cheviots include the Otterburn Training Area, the UK’s largest firing range, where the Ministry of Defence train up to 30,000 soldiers a year.