Arenig Fach
4 classifications here — Trail 100, Marilyn, HuMP and Simm — belong to lists OpenFell holds only part of, so they have no list page. See how far the coverage goes.

- Height
- 688.8 m · 2,260 ft
- Prominence
- 297.6 m
- Grid reference
- SH 82029 41595
- Coordinates
- 52.95869, -3.75771
- County / area
- Gwynedd
- OS Landranger
- 124 125
- OS Explorer
- OL18E
- Summit feature
- boulder 5m SW of trig point
- Key col
- SH 7863 3872 (391.2 m)
About Arenig Fach
Arenig Fach is a peak of the Arenig range in southern Snowdonia, north of its parent Arenig Fawr and close to Llyn Celyn beside the A4212 between Trawsfynydd and Bala. Carnedd y Filiast and Foel Goch lie east; Moel Llyfnant, Gallt y Daren and Arenig Fawr are to the south.
Rising out of the Migneint moorland, it reads as a bulky heathery lump from most angles, but the north-eastern face is quite different: steep cliffs above a small corrie lake, Llyn Arenig Fach. The summit, at the north end of a wide plateau, is called Carnedd Bachgen after the ancient cairn Carnedd y Bachgen just to its north-east, and carries a trig point and a substantial shelter cairn.
Background written from facts in the Wikipedia article on Arenig Fach (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
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- Sunset
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- Daylight
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- Civil twilight ends
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Computed astronomically for 52.959, -3.758. Plan your finish with the daylight safety planner.
Summit weather live
Loading forecast for the summit (689 m)…
Forecast adjusted to summit altitude. Weather data from MET Norway (CC BY 4.0).
Nearest listed peaks
| Peak | Height | Distance |
|---|---|---|
| Arenig Fawr | 854 m | 4.7 km |
| Carnedd Llechwedd-llyfn | 644.1 m | 4.7 km |
| Arenig Fawr South Top | 837 m | 5 km |
| Arenig Fawr South Ridge Top | 714 m | 5.7 km |
| Carnedd y Filiast | 669 m | 5.9 km |
| Moel Llyfnant | 751 m | 6.5 km |