Sandy BeachLlanfaethlu, Anglesey

Sandy beach, Llanfaethlu, Anglesey, North Wales

Sandy beach, or Porth Tywyn Mawr as it is locally known, which translates roughly as’ big’, or ‘great warren’ bay, is very pretty. Although it is quite big, it has that delightfully secluded feel. Providing the ideal base for an old-fashioned seaside holiday, it’s also a haven for walkers and watersports enthusiasts too! Not only is it dog-friendly, but there’s easy access and lots of sand for building castles. It really is a lovely spot.

Being approximately 800 yards wide and backed by dunes, it’s one of Anglesey's larger beaches, with plenty of space for the whole family to have fun. It's a little off the beaten track and one of the most tranquil spots on the island.


On the whole, Sandy Beach is relatively quiet, especially out of season. But go there on a sunny summer’s day and it’ll be buzzing! For an unspoilt ‘sandy’ beach, picturesque dunes, wonderful views, clean water - and a bay large enough for a variety of pastimes, Porth Tywyn Mawr comes highly recommended by holidaymakers and locals alike!

At a glance
  • Very family friendly.

  • Great for walks - with and without the dogs.

  • Large and sandy - with room for everyone!

  • A ‘beach’ shop close by - selling ice-cream.

  • Popular for all types of watersports.

  • Wonderful views and sunsets to die for.

Beach info

Beach type



No loos - however, these can be found a few miles north in Church Bay. The closest village, Llanfaethlu, offers a village shop and a pub/restaurant.

Boat launching does take place here, but it’s at the discretion of the nearby caravan site, and a locked gate will otherwise stop you. The best thing to do is phone their reception first (01407 730496) or drop into the shop to ask about it. NB There’s a sign close to the shop that says powerboats can only be launched with the correct boat handling qualifications!


100m of the road, leading down to the beach has been designated for parking. However, a gate to a little field is often left open for parking too.


Relatively easy for all - including pushchairs and wheelchairs.

Dog restrictions

There are no restrictions. 

Top tips
Flora & Fauna
Weather & tide

A popular kitesurfing beach, especially for beginners.


To launch you need to contact the nearby caravan park.


There’s clean sand, with rocks at either end - you’ll be fishing onto a mixed bottom. Be aware that at the south-west end there’s a large caravan park, thus the beach can get busy during peak season. Fish often caught here include whiting, pollack, dogfish, bass, coalfish, codling - and all manner of flatfish. Popular fishing spots are off the various rock ledges.



You are responsible for your own safety when visiting a suggested beach. We make no representations or warranties as to the accuracy of the information on this site in relation to any of the suggested beaches. While we try to ensure that all beaches on this site are suitable for the purpose for which they are suggested, you should be aware that no beach is entirely safe and all beaches carry a degree of risk to person and property. It is your responsibility to ensure that you mitigate any such inherent risks.

We accept no responsibility for loss or damage to personal effects, personal accident, injury or public liability in relation to a suggested beach on this site (although we do not exclude or limit in any way our liability to you where it would be unlawful to do so). Furthermore, while we try to ensure that all suggested beaches are open to the public, this is liable to change and you should ensure that this is the case before you visit. Please respect private property (including livestock), as we accept no responsibility for trespassing or damage to private property, to either you or any third party. Please take extra care around steep drops on cliff paths. Water quality may vary and be aware that some beaches may not allow dogs.

Always follow advice from relevant authorities, including HM Coastguard and any lifeguards present on the beach. Swimming flags must always be adhered to. Currents can be strong enough to drag even a strong swimmer, and rocks and unexpected shallow or deep water may not always be obvious. Swimming should only be done in calm conditions when supervised from land, ideally by a lifeguard on a flagged beach. Avoid swimming around boats, jet skis or surfers. Check the weather forecast and tide timetables in advance of a visit to a beach. Always pack water and appropriate clothing. Be aware of the risk of sunburn and wear a high-factor sun-cream. Children and pets should be supervised at all times, and dogs should be kept on a lead.

The contents of this site is provided for general information only. It is not intended to amount to advice on which you should rely. Where this site contains links to other sites and resources provided by third parties, these links are provided for your information only. Such links should not be interpreted as approval by us of those linked websites or information you may obtain from them. We have no control over the contents of those sites or resources.

If you do find any errors relating to any of our suggested beaches, we would be grateful if you would let us know by emailing us at

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