Hotel · Indoor poolTre-Ysgawen Hall & Spa
Llangefni, North Wales4-star hotel
Best for
- Swimming whatever the weather (indoor pool)
- A swim and spa break (spa facilities)
Not for
- Swimmers who need the pool length before booking (not yet checked)
Indoor poolCaernarfon, North Wales3-star hotel

Photo: Booking.com
Where details are marked 'Not yet checked', we only show what we know for certain: whether there's a pool and whether it's indoor or outdoor.
At Celtic Royal Hotel & Spa, a 3-star hotel in Caernarfon, North Wales, you'll find an indoor swimming pool.
We have not yet checked the length, water temperature or swim times of this pool. Until we have, the Pool Card shows them as not yet checked.
Dogs are allowed, so it works for a trip with the dog. Family rooms are available. Electric vehicle (EV) charging is available. Guests give it 7.7/10 (more than 2,000 reviews).
Room prices change daily and come live from our booking partner, so we don't publish them here.
The map loads from OpenStreetMap when you ask for it.
Yes. Celtic Royal Hotel & Spa has an indoor swimming pool.
Yes, dogs are allowed at Celtic Royal Hotel & Spa. Pools themselves are not normally open to dogs, so ask about the pool area.
Hotel · Indoor poolLlangefni, North Wales4-star hotel
Best for
Not for
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Listing data updated 29 September 2026. Pool details show the date they were checked. How we check pools · Affiliate disclosure
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