Cambrian Mountains, Powys, Wales
Pumlumon is Wales's forgotten mountain — the vast, boggy summit where the rivers Severn and Wye are born. Genuinely remote, completely trackless and extraordinarily wild. RambleMetric tells you when it's safely walkable.
About Pumlumon (Plynlimon)
RambleMetric is a real-time conditions app for Pumlumon (Plynlimon) — at 752 m the highest point of the Cambrian Mountains and source of both the Severn and the Wye, two of Britain's greatest rivers. A vast, trackless peat bog with an extraordinary sense of wildness and remoteness within Wales.
Pumlumon is one of Wales's most challenging and unfrequented mountains. There are no maintained paths on the summit plateau — the approaches are through deep, trackless peat bog. Navigation skills and full mountain equipment are essential. No phone signal anywhere on the mountain. Weather changes extremely rapidly. Several walkers have required rescue from this apparently modest summit.
Walking Routes
Check the live Visit Score before you set out — conditions here change fast.
Wales's remotest mountain experience. Trackless peat bog, no phone signal, weather changes rapidly. Map, compass and GPS essential. Not suitable for inexperienced walkers.
Plan Your Visit
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Key Features
Two of Britain's greatest rivers — the Severn (354 km, Britain's longest) and the Wye (215 km) — both rise within metres of each other on the Pumlumon plateau. A remarkable geographical fact in one of Wales's wildest places.
Pumlumon is the highest point of the Cambrian Mountains — the remote upland spine of Wales, sometimes called the 'Green Desert of Wales'. One of the least visited upland areas in Britain.
Live Data
All data is fetched from authoritative UK sources and recalculated every few minutes.
Safety Information
The most practical approach is from Eisteddfa Gurig on the A44 — the forestry track leads to the open mountain. From here the route to the summit is pathless across deep peat — map and compass essential, GPS recommended. Allow a full day. The Nant-y-moch reservoir approach from the west is longer but equally boggy. Never attempt in poor visibility without navigation skills.
All data, scores and recommendations are for informational purposes only. The Visit Score is an algorithmic estimate — not a substitute for your own judgement, local knowledge or official guidance.
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