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100 mile ultra runs in Gwynedd in Summer

Find 100 mile ultra runs in Gwynedd in Summer - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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  • Sat 11 - Sun 12 Jul 2026
Caernarfon, Gwynedd, UK

Black Diamond Yr Wyddfa Snowdon24

  • 24 hrs trail running + 3182 ft ascent

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