Foel Cwm-Sian Llwyd · Foel Cwm Sian Llwyd
One classification here — Simm — belongs to a list OpenFell holds only part of, so it has no list page. See how far the coverage goes.
- Height
- 648 m · 2,126 ft
- Prominence
- 58 m
- Grid reference
- SH 99588 31387
- Coordinates
- 52.87054, -3.49325
- County / area
- Gwynedd
- Region
- Bala to Welshpool
- OS Landranger
- 125
- OS Explorer
- 255
- Summit feature
- trig point
- Key col
- SH990298 (590 m)
About Foel Cwm-Sian Llwyd
Foel Cwm-Sian Llwyd is a subsidiary summit of Cyrniau Nod within the Hirnantau, the part of the Berwyn range in north-east Wales. The Snowdonia National Park boundary passes across the summit itself, making this the most easterly 2,000 ft top inside the park.
A trig point marks the high ground, and a ruined stone tower stands at the northern end of the summit area. The view is far-reaching but the surrounding moorland is flat and largely featureless.
Background written from facts in the Wikipedia article on Foel Cwm Sian Llŵyd (CC BY-SA 4.0). Heights, prominence and grid references come from the Database of British & Irish Hills, not from Wikipedia.
Access rights here
Conditional Right to roam: Right to roam only on mapped CRoW open access land.
Permission needed Wild camping: Permission needed everywhere.
General position for Wales — local byelaws, seasonal restrictions and closures can override it. Full details: access rights in Wales · check another location.
Daylight at this summit today
- Sunrise
- —
- Sunset
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- Daylight
- —
- Civil twilight ends
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Computed astronomically for 52.871, -3.493. Plan your finish with the daylight safety planner.
Summit weather live
Loading forecast for the summit (648 m)…
Forecast adjusted to summit altitude. Weather data from MET Norway (CC BY 4.0).
Finding the summit
The recorded summit point is trig point. On broad or flat summits the obvious cairn is not always the true high point.
- Survey method
- Abney level
- Record revised
- 23-Oct-23
- Drop measured from
- SH990298 · 590 m
Survey notes are field observations recorded in the Database of British & Irish Hills (v18.3, CC BY 4.0) by the hill-surveying community.
Which hill this one belongs to
Foel Cwm-Sian Llwyd is not counted as an independent hill in its own right. In prominence terms it belongs to Foel Cedig (668 m) — the nearest Marilyn you can reach from this summit without first dropping below its key col, 590 m.
Grouping is by prominence alone: a summit belongs to the nearest higher Marilyn it connects to without a deeper intervening col. Over a large massif that can gather hills no one would walk in a single day, and which few would describe as parts of the same mountain — it is a measure of independence, not a suggested route.
Nearest listed peaks
| Peak | Height | Distance |
|---|---|---|
| Y Groes Fagl | 659 m | 2.5 km |
| Foel Cedig | 667.5 m | 3.4 km |
| Stac Rhos | 629.8 m | 4.4 km |
| Pen y Boncyn Trefeilw | 644.2 m | 4.5 km |
| Cefn Gwyntog | 614 m | 5.1 km |
| Post Gwyn | 665 m | 5.6 km |