UMUK 355


UMUK 355 is a three-day ‘more than iron-distance but less than ultraman-distance’ staged triathlon of 355km, consisting of:

Day 1

5 km (3.1 miles) swim followed
by 100km (62.5miles) bike

Day 2

195 km (121.8 miles) bike

Day 3

55 km (34.3 miles) run


Friday 01st September to Sunday 03rd September 2023.


Our event HQ is Swallow Falls Hotel, Betws-y-Coed, LL24 0DW.

Pre-race ‘meet and greet’ will take place in Betws (venue TBC).

With the exception of Day 1, which starts at Lake Bala (Llyn Tegid), all other stages start and finish at Race HQ.

Registration and event briefing will be done on-line.


6pm to 7pm. Pre-race ‘meet and greet’ (Attendance is not mandatory but it is highly recommended)

Day 1: 7am start at Lake Bala. Finish at race HQ by 7pm

Day 2: 7am start at race HQ. Finish at race HQ by 7pm

Day 3: 7am start at race HQ. Finish at race HQ by 7pm


Each day will have a 12 hour cut off, with the swim stage having a cut off of 6 hours.


 This event is unsupported ie. there will be no aid stations or road signage on the course. You must use a support crew, consisting of two adults and no more than one vehicle, who will accompany you throughout all stages of the course. Your support crew will be responsible for navigating the course and providing you with nutrition. (The swim stage is organised such that you will not require a support boat). Please refer to Rules and Guidelines for more info regarding Support Crews.


Qualifier for UMUK 515 (full ultraman-distance). Also, an ideal opportunity for those considering the full ultraman-distance to recce our stunning yet demanding routes.

Perfect introduction to ultra-distance stage racing and the different challenges associated with competing over three consecutive days.

Bridges the gap between iron-distance and ultraman-distance racing.

Beautiful yet brutal courses with no repetition. Just one big loop each day full of incredible scenery.

After each gruelling day, you get a well-deserved rest before tackling the next challenge!

A great weekend away with your mates! (if you choose to bring a support crew… and if not, make some new mates!). No other event comes close in terms of the bond formed between you and your crew over the three days.

Superb and friendly atmosphere as everyone involved in UMUK events – staff, athletes, support crews – is there for the duration of the long weekend.

We can’t guarantee you’ll leave with a finishers’ medal, but we can guarantee you will go home with incredible memories and a load of new friends!


£ 1

What do I get?

  • Three days of racing through some of the most breathtaking scenery in the United Kingdom
  • Full safety support on the water (kayaks and motorboat)
  • Full safety support on the road
  • Bike mechanic on course on Day 1 and Day 2
  • Athlete’s pack and goody bag containing: a UMUK swim cap, two high-vis vests for your support crew and more…
  • UMUK tech shirt and medal for finishers
  • Race HQ with parking, toilets and pub!
  • Official event photographers to beautifully capture your highs (and lows)
  • Access to sports massage therapist at HQ
  • Live tracking so your crew, friends and family can follow your progress
  • Morale support from our amazing team!
  • A head full of awesome memories and an overwhelming sense of achievement!


Entry to UMUK 355 is by invitation only. Organisers will select and invite a maximum of 30 athletes on a first come, first served basis as the applications are received and if otherwise qualified. The selection of invitees will be based upon the experience, qualifications and criteria met for each applicant.

It is recommended that the applicant will have completed at least one iron distance race within the previous 18 months of the event being applied for. Other ultra-distance events are also considered as qualifiers assuming they have distances equal to or greater than iron distances. Other solo long distance events are considered if it is deemed they require the planning and training that would be of benefit to the athlete doing UMUK 355.

Racing Quest (UK) Limited
Registered in England and Wales No: 10959675
Registered Address: 17 Chaffinch Walk, Cambridge CB23 6BD.

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