Dduallt
2 classifications here — HuMP and Simm — belong to lists OpenFell holds only part of, so they have no list page. See how far the coverage goes.

- Height
- 662.8 m · 2,175 ft
- Prominence
- 139.6 m
- Grid reference
- SH 81057 27372
- Coordinates
- 52.83068, -3.76696
- County / area
- Gwynedd
- OS Landranger
- 124 125
- OS Explorer
- OL23E
- Summit feature
- cairn on outcrop
- Key col
- SH 7990 2646 (523.2 m)
About Dduallt
Dduallt, 'black hill' in Welsh, rises in central Snowdonia north of the A494 between Dolgellau and Llanuwchllyn. It is the sister peak of Rhobell Fawr and the two are often climbed together.
The Afon Dyfrdwy, the River Dee, rises on its eastern slopes. Approaches are usually made from the south-west, as large boggy areas lie to the north and east and the eastern face is very steep.
Background written from facts in the Wikipedia article on Dduallt (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 52.831, -3.767. Plan your finish with the daylight safety planner.
Summit weather live
Loading forecast for the summit (663 m)…
Forecast adjusted to summit altitude. Weather data from MET Norway (CC BY 4.0).
Which hill this one belongs to
Dduallt is not counted as an independent hill in its own right. In prominence terms it belongs to Rhobell Fawr (734 m) — the nearest Marilyn you can reach from this summit without first dropping below its key col, 523 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 |
|---|---|---|
| Rhobell Fawr | 734 m | 2.9 km |
| Aran Benllyn | 885 m | 6.4 km |
| Erw y Ddafad-ddu | 872 m | 6.7 km |
| Aran Fawddwy | 905.6 m | 7.2 km |
| Foel Boeth | 615.4 m | 7.5 km |
| Waun Camddwr | 621.7 m | 7.7 km |