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100 mile ultra runs in South East in April 2026

Find 100 mile ultra runs in South East in April 2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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Tackle the new addition to the Thames Ring Series — a 100-mile ultra along rivers and canals, combining stunning scenery, grit, and determination in one unforgettable endurance adventure.
  • Fri 24 Apr 2026
  • £100-£120
Reading, Berkshire, UK

Thames Ring Series | TR100

Tackle the new addition to the Thames Ring Series — a 100-mile ultra along rivers and canals, combining stunning scenery, grit, and determination in one unforgettable endurance adventure.

  • Enter online
  • GPS tracking
  • Flat
  • Age 18 & over
  • 100 miles trail running

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