Mynydd Tŵr a Chaer y Tŵr · Holyhead Mountain and Caer y Tŵr

South Stack RSPB Reserve & Holyhead Mountain, Anglesey

Ffeithiau'r daith · Walk facts

Pellter · Distance: 4.8 miles (7.7 km)
Amser · Time: 3 hours
Anhawster · Difficulty: Strenuous
Math o daith · Route type: Circular
Man cychwyn · Start: Ellin's Tower car park, South Stack
Cyfeirnod grid · Grid ref: SH 211818
Cod post · Postcode: Dim yn y ffynhonnell · Not given by the source
what3words: Dim yn y ffynhonnell · Not given by the source
Parcio · Parking: RSPB South Stack car parks: charges apply all year; 7 Blue Badge spaces; no overnight parking (RSPB).
Cyfleusterau · Facilities: RSPB Visitor Centre café and toilets, 10am–5pm daily. No toilets in Ellin's Tower (RSPB).
Cŵn · Dogs: Welcome on the reserve and in Ellin's Tower, under control and on the paths; not inside the café (RSPB). Dogs welcome at Caer y Tŵr (Cadw).
Tir · Terrain: Cadw rates Caer y Tŵr Terrain Level 4, Strenuous: it may be slippery or muddy underfoot.
Hygyrchedd · Accessibility: Gentle taster: a level path runs from Ellin's Tower car park to the viewpoint outside Ellin's Tower (RSPB; distance not given). The coastal trail is more rugged, uneven and narrow.

Ramblers route library Cadw: Caer y Tŵr RSPB South Stack: facilities Visit Anglesey: Holyhead Mountain circular walk (Challenging, about 12.7 miles, from Breakwater Country Park, GPX) Holyhead Breakwater Country Park (Anglesey Council)

Gwiriwyd ddiwethaf · Last checked: 2026-11-01

Chwedl Mythôn · Mythôn legend

Islanders have long told of a giantess who spilled stones from her apron at Barclodiad y Gawres. Mythôn legend says Eirgawr is of that giant kin, and from the top of Holyhead Mountain it watches the whole island, from South Stack to the Menai, without a word.

Beth i chwilio amdano · What to look for

Caer y Tŵr's Iron Age ramparts, still 3 m high and 4 m thick in places (Cadw)
The ruin of a Roman watchtower beside the summit trig point
South Stack lighthouse, lit since 1809
Guillemots, razorbills and puffins in spring, and choughs all year (RSPB)

Diogelwch · Safety

Sea cliffs and falls from height: keep well back from edges and keep children close (Cadw: falls from height).
Don't climb the ancient walls (Cadw).

No drones on the RSPB reserve 1 March–31 July. Caer y Tŵr is open all year during reasonable daylight hours, and free (Cadw).

Dilynwch arwyddion a chyngor y ffynhonnell swyddogol bob amser · Always follow the signs and the official source's advice.

Cod Cefn Gwlad · Countryside Code