Glaciated Upland Landscapes & Landforms
Why Glaciated Uplands Look the Way They Do
Around 18,000 years ago much of upland Britain lay under thick ice. Glaciers shaped the rock as they flowed, leaving today’s dramatic peaks, valleys and lakes. The UK’s glaciated uplands — the Lake District, Snowdonia, the Cairngorms, the Scottish Highlands — are relict landscapes: the ice itself has gone, but the landforms remain. Today’s climate continues to chip at them through freeze-thaw weathering and slope processes, but the dramatic shapes are inheritances from the last Ice Age.
How Glaciers Erode
Glaciers erode in two main ways. Plucking happens when meltwater at the base of the ice freezes around loose rock; as the glacier moves on, the rock is ripped out of the bedrock. Abrasion happens when the rocks frozen into the glacier’s base scrape across the bedrock below, leaving long parallel scratches called striations. The two processes work together: plucking takes blocks out, abrasion smooths what is left.
The four key erosional landforms are corries (armchair-shaped hollows), arêtes (knife-edge ridges), pyramidal peaks and U-shaped glacial troughs. They form when ice plucks and abrades hard upland rock.
Erosional Landforms
A corrie (also called a cwm in Wales or cirque in the Alps) is an armchair-shaped hollow on a mountain side. Snow accumulated in a sheltered hollow and compressed into ice; rotational movement of that ice plucked the back wall and abraded the floor; meltwater froze into cracks and prised out more rock. After the ice melted, a small lake (a tarn) often formed in the hollow. Red Tarn below Helvellyn is a textbook example. Where two corries developed back-to-back on opposite sides of a ridge, the rock between them was eroded down to a knife-edge arête — Striding Edge in the Lake District is a famous one. Where three or more corries surrounded a peak, the result is a pyramidal peak like Snowdon or the Matterhorn.
When a glacier flowed downhill it widened, deepened and straightened the valley it occupied. River-cut V-shaped valleys became U-shaped glacial troughs with steep sides and flat floors. The original interlocking spurs of the river were sheared off into truncated spurs. Tributary glaciers cut their valleys less deeply; once the ice melted, those valleys hung above the main trough as hanging valleys, often with a waterfall plunging from the rim. Llyn Ogwen in Snowdonia and Wast Water in the Lake District sit in classic glacial troughs.
Depositional Landforms
Glaciers also dump material when they melt. Unsorted rocks and clay carried by ice are called moraine. Ground moraine blankets valley floors. Terminal moraine piles up at the snout of a glacier where ice melts as fast as it advances; it forms a curved ridge across the valley. Smaller landforms include drumlins — egg-shaped hills of moraine, with the steep end pointing in the direction the ice came from — and crag and tail, where harder rock protected softer rock from erosion behind it (Edinburgh Castle Rock and the Royal Mile is the classic example).
Sheep farming dominates UK uplands — hardy breeds like Herdwick graze where almost nothing else can. Conifer forestry plantations occupy steeper slopes, especially in the Lake District and Northumberland. Settlement sits in the valleys: stone-built villages like Grasmere and Beddgelert serve walkers and tourists. Reservoirs drown some valleys to supply distant cities — Thirlmere in the Lake District has fed Manchester since 1894. Each use changes the landscape, sometimes preserving its character (drystone walls, hedgerows), sometimes degrading it (overgrazing, soil erosion).
A Distinctive UK Glaciated Upland: The Lake District
The Lake District National Park covers 2,362 km2 in north-west England. Its slate, granite and volcanic rocks were folded by the Caledonian orogeny then sculpted by Ice Age glaciers into an iconic landscape: 16 main lakes filling glacial troughs, arêtes like Striding Edge and Sharp Edge, and corries such as Red Tarn below Helvellyn (950 m). Today over 18 million visitors a year bring £1.4 billion to the local economy but also create challenges: footpath erosion on Helvellyn cost the National Trust around £1.5 million to repair in the 2010s; second-home ownership pushes house prices beyond local wages; lake water quality has fallen as tourism intensifies.
Reservoirs supply clean water at scale and provide hydropower, but they drown valleys (and sometimes villages, as at Mardale Green under Haweswater). Wind farms generate renewable energy but change visual character — a major issue in protected upland landscapes. Tourism funds conservation and rural businesses but pressures footpaths, wildlife and housing. Conservation through National Park status protects landscapes but adds planning costs for residents who want to extend their homes. There is no neutral choice in upland development — every option carries trade-offs.
The Lake District contains arêtes (Striding Edge on Helvellyn), corries with tarns (Red Tarn), glacial troughs (Wast Water) and ribbon lakes — all carved by ice 18,000 years ago and now under tourism pressure.