The Mounth is the broad upland in northeast Scotland between the Highland Boundary and the River Dee. It is invariably referred to as "The Mounth" and pronounced "munth". The name is derived from Scottish Gaelicmonadh which is akin to the Welshmynydd, and may be of Pictishorigin, meaning simply "upland". Traditionally the people of northern Scotland did not consider the Grampians to be a single range, but several, and these were known as the Mounths. The ranges to the north-west are known as the Monadh Liath and the Monadh Ruadh, meaning the Grey Mounth and the Red Mounth. Some sources regard the Mounth as extending as far west as Drumochter Pass, but it is now generally agreed to start at the Cairnwell Pass. Here, a high undulating plateau invaded by deep glacial troughs culminates in Glas Maol on the main watershed, with the outlying granite Lochnagar and its surrounding "White Mounth". To the east the plateau broadens into a lower moorland incised by river valleys, notably Glen Esk and Glen Tanar, descending gently east to North Sea coastal cliffs between Stonehaven and Aberdeen. This is the best-preserved expanse of the ancient Highland pre-glacial upland surface. The Mounth is thus bounded by Blairgowrie, Braemar, Ballater, Banchory, Stonehaven, and Kirriemuir, and comprises eastern Highland Perthshire, the Angus Glens, and southern Aberdeenshire. The higher parts are within the Cairngorms National Park. Historically The Mounth was a formidable barrier which, to some extent, isolated the northeast of Scotland from the Scottish Lowlands, physically and culturally. In the Middle Ages an ancient roadway known as the Causey Mounth was built to connect Stonehaven to Aberdeen using an elevated rock causeway design to penetrate this boggy area of the eastern Mounth. This route was by way of Cowie Castle, Muchalls Castle, Portlethen Moss and the Bridge of Dee. The route was that taken by Earl Marischal and the Marquess of Montrose when they led a Covenanter army of 9000 men in the first battle of the Wars of the Three Kingdoms in 1639.
Crossings of the Mounth
There are numerous historic crossings of the Mounth, including:
Causey Mounth or Cowie Mounth, between Bridge of Cowie near Stonehaven and the Bridge of Dee.
Elsick Mounth or Netherley Road, from Stonehaven to Drum, followed by the modern B979 road
The Slug Road, from Stonehaven to Durris, followed by the modern A957 road
Cryn's Cross Mounth, from Laurencekirk to Mills of Drum
