Pen Twyn Mawr

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 51.934, -3.104. Plan your finish with the daylight safety planner.

Finding the summit

The recorded summit point is no feature 15m NE of cairn. 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

SO242270 · 640 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 Twyn Mawr is not counted as an independent hill in its own right. In prominence terms it belongs to Waun Fach (811 m) — the nearest Marilyn you can reach from this summit without first dropping below its key col, 640 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