BigSea Trails (WATER)

JUN
7
2026
BigSea Trails WATER runs from Knoll Beach around the Isle of Purbeck on scenic single loop routes past cliffs, coves and Old Harry Rocks. Options range from a half marathon to a 54k ultra with coastal views and a tree planting option.
Sun 7 Jun 2026
54 kilometers 26 miles 18 miles 13 miles

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Event overview

BigSea Trails (WATER) is a trail running event on the Isle of Purbeck, Dorset. The event starts and finishes on the sand of Knoll Beach at Studland and uses single-lap routes that pass through the Purbeck Hills, Corfe Castle, Kimmeridge Bay, Chapmans Pool, Dancing Ledge, Durlston Castle and Old Harry Rocks. The event is part of the Classic Element Trail Series.

Race details

Distances and entry prices:

  • Half Marathon - £36, open to entrants aged 17 and over
  • 18 Miles - £44, open to entrants aged 18 and over
  • Marathon - £52, open to entrants aged 18 and over
  • 54k Ultramarathon - £64, open to entrants aged 18 and over

Cut-off times:

  • Half Marathon and 18 Mile - 5 hours
  • Marathon and 54k - 9 hours

Canicross entries are not accepted. A bag drop tent will be available on the day.

Support, kit and services

All runners must carry at least 500 ml of fluid; hydration vests or handheld soft flasks are permitted. Runners are advised to carry appropriate clothing for variable conditions and to download the GPX route file because course arrows can be tampered with. Aid stations - locations to be confirmed - will offer sweet and savoury snacks, vegan options, water and flat coke. The event is cupless and has a partnership with Precision Fuel & Hydration; aid stations will offer PH 1000 electrolyte drink, which delivers 1,000 mg of sodium per litre. Classic Element Trail Series T-shirts are available to pre-order and runners can opt to have a tree planted instead of a finishers medal. Visit the organization's website for the most recent information.

54 km
54k Ultramarathon
26 mi
Marathon
18 mi
18 Miles
13 mi
Half Marathon