The two stone beehive cairns marking the bare, rocky summit of Drygarn Fawr in the Cambrian Mountains

Region guide

Cambrian Mountains & Mid Wales

Pen Pumlumon Fawr is a considerable hill, lofty and remote.

Jim Perrin, climber and outdoor writer

Highest Mountain

Pumlumon Fawr — 753m

Longest River Source

River Severn — 354km

Long-Distance Crossing

Cambrian Way — 479km

Highest Waterfall

Pistyll y Llyn — 73m

Dark Sky Park

Elan Valley — 45,000 Acres

Reservoir Capacity

Elan Valley — Around 100 Billion Litres

About the region

Discover the Cambrian Mountains & Mid Wales

The Cambrian Mountains occupy the quiet centre of Wales, where rounded summits, open moorland and reservoir valleys stretch between Eryri and Bannau Brycheiniog. The hills are rarely technically difficult, but long approaches, wet ground and limited paths make them far more serious than their heights suggest.

Pumlumon Fawr is the region’s highest point and the source of the River Severn. The Wye and Rheidol also begin on the wider massif, sending water towards three different coasts. Its neighbouring summits provide spacious ridge walks above a landscape of blanket bog, forestry and remote valleys.

Farther south, the Elan Valley combines Victorian engineering with wild upland walking. Reservoirs fill deep valleys beneath broad, frequently pathless hills such as Drygarn Fawr, whose two distinctive beehive cairns rise above one of the least populated parts of Wales. Eastward, Radnor Forest offers steeper, more defined summits including Great Rhos, Black Mixen and the shapely Whimble.

This is not a region of dramatic pinnacles or crowded summit paths. Its appeal lies in distance, silence and the freedom to cross high ground without meeting many people. Navigation matters, particularly when cloud removes the few available landmarks. So do waterproof boots: Mid Wales has never been overly troubled by drought.

Regional signature

The Great Welsh Watershed Legacy

Three Great Rivers

Severn, Wye and Rheidol

All three rise around the Pumlumon massif before flowing in different directions towards the Bristol Channel, the Severn Estuary and Cardigan Bay.

The Elan Valley

Water carried to Birmingham

A chain of reservoirs and gravity-fed aqueducts has supplied water to Birmingham since 1904, without requiring pumps along most of its journey.

The Desert of Wales

A roadless upland heartland

The Elenydd contains some of the most sparsely populated and inaccessible country in Wales, with broad moors, peatland and very few settlements.

When to visit

Spring

March – May

Higher rainfall keeps the streams and waterfalls flowing strongly. Improving daylight makes longer Pumlumon and Elan Valley routes more practical.

Best for: River valleys, waterfalls and quieter summits

Summer

June – August

Long daylight helps with the region’s lengthy approaches. Paths can be faint or absent, so carrying a map and compass remains essential.

Best for: Cambrian Way sections and remote hill days

Autumn

September – November

Heather and rough grass bring colour to the uplands, while cooler air can produce far-reaching views. Persistent rain quickly saturates the peat.

Best for: Reservoir views and open moorland colour

Winter

December – February

Snow is possible on the highest ground, but wind, rain and poor visibility are more frequent concerns. Short daylight makes remote routes particularly committing.

Best for: Experienced navigators and lower reservoir walks

TrailTrack Favourites

Ten hills chosen by TrailTrack

Continue exploring

Ready to Explore the Cambrian Mountains & Mid Wales?

Follow the rivers towards their source and discover the quiet, roadless hills at the heart of Wales.

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