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A487

Anglesey and the Llŷn peninsula

Castles and sea cliffs of north-west Wales: Beaumaris, South Stack and Caernarfon, then the quiet Llŷn coast to Aberdaron and Criccieth.

Distance
226 km (140 mi)
Driving
3 h 07 min
Suggested days
3
Stops
8
Countries
United Kingdom
Updated
June 14, 2026

At a glance: 3-day road trip of about 226 km (140 mi) with 8 stops, from Conwy to Porthmadog. About 3 h 07 min of driving in total.

More road trips in United Kingdom

Route description

From Conwy take the A55 west and cross the Menai Strait to Anglesey, either on the A55 Britannia Bridge or on Telford’s suspension bridge of 1826, which has a 7.5-tonne limit and roadworks planned until 2027. The A545 follows the strait to Beaumaris, a Georgian town beside Edward I’s last and most symmetrical castle. Parking on the green by the seafront is close to both the castle and the pier, and it takes most vehicles.

Return to the A55 and head west across the island to Holyhead, about 45 minutes. South Stack lies on Holy Island’s western cliffs, signposted from the town. The RSPB reserve has a car park and clifftop paths; about 400 steps lead down to the bridge and the lighthouse, but only on days when it is open, so check before you go. Come in spring and early summer for the seabirds.

Cross back to the mainland on the Britannia Bridge and follow the A487 to Caernarfon, where the grand castle stands over the harbour and the town walls are nearly complete. The A499 and B4417 then run down the north coast of the Llŷn. Park at Morfa Nefyn and walk out to Porthdinllaen, a fishing hamlet on the sand where cars are not allowed.

Narrow lanes lead on to Aberdaron near the end of the peninsula; Bardsey Island lies just offshore beyond the headland. Head east along the south coast via Abersoch and Pwllheli to Criccieth, where the castle stands on a headland between two beaches. Porthmadog is ten minutes on; the Ffestiniog Railway starts here and Portmeirion is just outside town. Lanes on the Llŷn are narrow, so larger motorhomes should keep to the A and B roads.

Stop-by-stop itinerary

In driving order. Distances are estimates between consecutive stops.

  1. 1

    Conwy

    United Kingdom
    Start
  2. 2

    Beaumaris Castle

    HistoryBeaumaris, United Kingdom

    Edward I began this near-symmetrical moated castle in 1295 but never finished it; it is part of a World Heritage Site with Conwy and Caernarfon. Cadw charges entry; park on the seafront green in town.

    22 km
  3. 3

    South Stack Lighthouse

    ViewsHolyhead, United Kingdom

    A white lighthouse on a rock islet below Holy Island’s cliffs, reached by about 400 steps and a small bridge only when it is open, which is not always. From April to July the RSPB clifftop reserve is busy with guillemots and razorbills.

    51 km
  4. 4

    Caernarfon

    United Kingdom
    42 km
  5. 5

    Porthdinllaen

    ViewsMorfa Nefyn, United Kingdom

    A tiny fishing hamlet on a sandy bay on the north coast of the Llŷn peninsula. Cars cannot drive down: park at the National Trust car park in Morfa Nefyn and walk along the beach at low tide or over the headland.

    36 km
  6. 6

    Aberdaron

    United Kingdom
    23 km
  7. 7

    Criccieth Castle

    HistoryCriccieth, United Kingdom

    A castle of the Welsh princes, later taken by Edward I, standing on a headland between two beaches. Cadw runs it with a small fee; park on the seafront below and walk up for views over Cardigan Bay.

    43 km
  8. 8

    Porthmadog

    United Kingdom
    8 km

FAQs

How long is Anglesey and the Llŷn peninsula?

3-day road trip of about 226 km (140 mi) with 8 stops, from Conwy to Porthmadog. About 3 h 07 min of driving in total.

How many days do you need for Anglesey and the Llŷn peninsula?

We suggest 3 days: about 3 h 07 min of driving, which leaves time for the stops.

Where does Anglesey and the Llŷn peninsula start and end?

It starts in Conwy and ends in Porthmadog.

Which countries does Anglesey and the Llŷn peninsula pass through?

United Kingdom.