Wales · Bannau Brycheiniog National Park

Yr Allt

DeweySimm

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
605.2 m · 1,986 ft
Grid reference
SN 90518 20054
Coordinates
51.86825, -3.59156
County / area
Powys
OS Landranger
160
OS Explorer
OL12E
Summit feature
tiny cairn 20m N of fence corner
Key col
SN 8997 1959 (565.2 m)

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 51.868, -3.592. Plan your finish with the daylight safety planner.

Summit weather live

Loading forecast for the summit (605 m)…

Forecast adjusted to summit altitude. Weather data from MET Norway (CC BY 4.0).

Finding the summit

The recorded summit point is tiny cairn 20m N of fence corner. On broad or flat summits the obvious cairn is not always the true high point.

Survey method
obvious summit/Leica RX1250
Record revised
05-Feb-23
Drop measured from
SN 8997 1959 · 565.2 m

Classification history: col surveyed by Leica RX1250.

Survey notes are field observations recorded in the Database of British & Irish Hills (v18.3, CC BY 4.0) by the hill-surveying community.

Get food nearby

3 places to eat or drink within 10 km of the summit, rated under the Food Hygiene Rating Scheme (Scotland runs its own Food Hygiene Information Scheme, a pass/fail equivalent).

Rated places to eat within 10 km of Yr Allt
PlaceTypeRatingDistance
Tafarn-y-GarregPub/bar/nightclub5 out of 56 km · SW
The Morgan Brothers' Coffee ShopRestaurant/Cafe/Canteen5 out of 57.6 km · SW
Storey Arms Outdoor Education CentreHotel/bed & breakfast/guest house5 out of 57.7 km · E

Classifications and ratings are the local authority's own and can be coarse — this is a lead, not a guarantee of opening hours or that food is served to non-residents. Follow a name through to the official rating page to check, and confirm before you rely on it.

Food hygiene data from the Food Standards Agency and Food Standards Scotland (Open Government Licence v3.0). Distances and directions computed by OpenFell from the summit.

Which hill this one belongs to

Yr Allt is not counted as an independent hill in its own right. In prominence terms it belongs to Fan Gyhirych (726 m) — the nearest Marilyn you can reach from this summit without first dropping below its key col, 565 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

PeakHeightDistance
Fan Nedd663 m1.8 km
Fan Fraith668 m2.5 km
Fan Gyhirych726.1 m2.6 km
Fan Llia631.9 m3.6 km
Cefn Cul561.8 m4.5 km
Carreg Cadno538 m5 km