Pen yr Allt Uchaf

About Pen yr Allt Uchaf

Pen yr Allt Uchaf is a subsidiary summit of Aran Fawddwy in the southern part of Eryri, sitting at the high point of a ridge that branches west from Aran Fawddwy's south ridge.

A small cairn marks the top, which looks down into Cwm Cywarch and across at the steep south faces of Glasgwm, Gwaun y Llwyni and Aran Fawddwy itself. At just over 630 m it is a Hewitt, Nuttall and Simm.

Background written from facts in the Wikipedia article on Pen yr Allt Uchaf (CC BY-SA 4.0). Heights, prominence and grid references come from the Database of British & Irish Hills, not from Wikipedia.

Access rights here

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 52.763, -3.675. Plan your finish with the daylight safety planner.

Finding the summit

The recorded summit point is no feature: grass. That distinction matters on broad or flat tops, where the obvious cairn is not always the true high point.

Survey method

Leica RX1250

Record revised

05-Feb-23

Drop measured from

SH 8752 2053 · 570.3 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

Pen yr Allt Uchaf is not counted as an independent hill in its own right. In prominence terms it belongs to Aran Fawddwy (906 m) — the nearest Marilyn you can reach from this summit without first dropping below its key col, 570 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