Set in the stunning Gower Peninsula – the UK’s first Area of Outstanding Natural Beauty and famous for its golden beaches, limestone cliffs, wild moors, ridges, and woodlands. Our basecamp is in the grounds of the historic Penrice Castle, with weekend camping options and the 100km challenge is a figure of 8 route made up of west & east loops which take in the best of the Peninsula, its history, and its varied, unique landscape. With 75km,  50km, Marathon, 25km, and 10K challenge options, as well as a bar & entertainment at basecamp – this event will be the highlight of the season!

Use code 25%CHARITY until 31 October 2025 for 25% off your registration fee.

Charity sponsorship

Pay a lower registration fee and fundraise for Terrence Higgins Trust.

Full challenge 100km -£50 reg fee & at least £575 fundraising/sponsorship1/2 challenge 50km - £40 reg fee & at least £375 fundraising/sponsorship1/4 challenge 25km - £30 reg fee & at least £275 fundraising/sponsorship

Mixed funding

Pay a higher registration fee your place and fundraise towards a lower target.

Full challenge 100km - £110 reg fee & at least £330 fundraising/sponsorship1/2 challenge 50km - £75 reg fee & at least £225 fundraising/sponsorship1/4 challenge 25km - £50 reg fee & at least £150 fundraising/sponsorship

Please check the Gower Peninsula Ultra Challenge website for the most up-to-date prices and special offer deals.

As part of our team, you’ll receive:

A Terrence Higgins Trust t-shirt to wear with prideExpert fundraising advice and unlimited support from our dedicated teamPre-event training guidance to help you prepare

On the day, you’ll enjoy:

Rest stops with drinks and refreshmentsAll meals and snacks included (depending on your chosen distance)Access to medics, massage services, and pace walkersA finisher’s medal, t-shirt, and a glass of bubbly to celebrate your achievement

Your support and fundraising help fund vital services including our one-of-a-kind sexual health helpline, HIV testing, counselling, and peer support programmes.

We are working to ensure that there will be no new HIV cases in the UK by 2030. Everyone living with HIV will be diagnosed, in treatment and care, free from stigma and able to take advantage of life’s opportunities.

Lace up those walking boots and trek to help us end new cases of HIV in the UK by 2030. To register or to find out more, visit the Gower Peninsula Ultra Challenge site.

Please don’t forget to choose Terrence Higgins Trust as your charity when signing up!

Action Challenge Ultra events are for a wide range of fitness & ages – and UK’s #1 series of treks & trial runs. Choose your challenge – do it at your pace, and there’re 18 events in the UK series. Action Challenges support enables you to go further, whilst enjoying the great outdoors & camaraderie. 

There’re marquee rest stops, lots of food & drink, medical & massage teams, with a fully signed route & GPS tracking to guide you. 

A big finish-line celebration awaits with an amazing sense of achievement, and once the aches subside you’ll feel energised, and up for more of life’s real challenges! 

See all the 2026 Ultra Challenge events

Any questions or want to tell us you're signing up to a trek? Contact our Fundraising team or checkout the Gower Peninsula Ultra Challenge factsheet.