BigSea Trails (WATER)

JUN
7
2026
BigSea Trails (WATER) is the water-themed event on the Isle of Purbeck, with single-lap coastal and hill routes from Knoll Beach. Four distances run to landmarks such as Corfe Castle and Old Harry Rocks with stocked aid stations and mandatory fluid carry.
Sun 7 Jun 2026
54 kilometers Marathon 18 miles Half Marathon

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BigSea Trails (WATER)

BigSea is the water-themed event in the Classic Element Trail Series, held on the Isle of Purbeck, Dorset. The event starts and finishes on the sand at Knoll Beach, Studland, and uses single-lap routes that pass coastal cliffs, hills and historic sites including Corfe Castle, Kimmeridge Bay, Chapmans Pool, Dancing Ledge, Durlston Castle and Old Harry Rocks.

Four distances are available:

  • Half Marathon
  • 18 Miles
  • Marathon
  • 54k Ultramarathon

Entries do not allow canicross. Race bibs are issued at registration and a bag drop tent is provided on the day. All runners must carry at least 500 ml of fluid; handheld soft flasks or hydration vests are permitted. Runners are advised to carry appropriate clothing for changeable weather and to download the GPX route file to a wearable device because markings can be tampered with.

Cut-off times are set by distance: Half Marathon and 18 Miles have a five hour cut off; Marathon and 54k have a nine hour cut off. Aid stations will be stocked with sweet and savoury snacks including vegan options, plus water and flat coke; the event operates as a cupless event. Precision Fuel & Hydration supplies PH 1000 electrolyte on course, and registered runners can collect two PFH gels at registration. Classic Element Trail Series T-shirts are available to pre-order and a Trees Not Tees option lets runners substitute a planted tree for a finisher medal. Visit the organization's website for the most recent information.

54 km
54k Ultramarathon
Marathon
Marathon
18 mi
18 Mile
Half Marathon
Half Marathon
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