A 13.1-mile coastal trail challenge from The Watersplash, following Jersey’s west and south coasts to the finish in St Helier.
The Half Marathon starts at The Watersplash in St Ouen’s Bay and follows the final section of the Round the Rock route along Jersey’s west and south coasts.
The route begins beside St Ouen’s Bay before passing Corbière and continuing towards St Brelade’s Bay. Runners then follow the coast through Beauport, St Aubin and towards the shared finish in St Helier.
Expect a varied course combining coastal paths, headlands, bays, steps, runnable sections and short road links. The event is suitable for experienced road runners moving onto trail, but it should not be treated as a flat or conventional road half marathon.
The route is marked at junctions and decision points rather than continuously. Long, obvious sections may have no markings, so every runner must also carry the route on a suitable watch or phone.
Read about the race ethos →The Half Marathon follows the final section of the Ultra course from The Watersplash to St Helier. Keep the sea on your right for most of the route and use the GPX alongside the race markings.
The Half Marathon starts at The Watersplash in St Ouen’s Bay. There is no dedicated event transport, so runners must arrange their own journey to the start.
LibertyBus services run from St Helier towards St Ouen’s Bay and The Watersplash.
A taxi or pre-arranged lift is a straightforward option from St Helier or your accommodation.
Parking around The Watersplash can be busy, and the race finishes in St Helier rather than returning to the start.
The Half Marathon uses the final Ultra checkpoint at Beauport. Supplies are simple and practical, so runners should still carry enough food and water to manage themselves throughout the route.
The Half Marathon checkpoint is reached after Corbière and St Brelade’s Bay. From Beauport, runners continue towards St Aubin and the finish in St Helier.
Carry a reusable cup, bottle or suitable drinking vessel. Disposable cups are not provided.
Bring your own supplies if you need particular products or have dietary requirements.
Carry enough food and water to manage yourself between the start, checkpoint and finish.
Round the Rock is a grassroots event organised by a very small team and supported by local volunteers. Please understand what the race provides — and what it does not — before entering.
The kit is there to protect you if you become injured, cold or unable to continue. Random or visual kit checks may take place. No kit means no start.
Abuse or aggression towards volunteers, race staff, members of the public or other runners will result in disqualification and may lead to exclusion from future events.
If you value trail over tarmac, challenge over convenience and community over corporate gloss, you should fit right in.
The key Half Marathon details are below. The Race Day Information page remains the definitive source for the latest operational information.
Read the full Race Day Information →Jersey’s coastal paths can be narrow, exposed, uneven and slippery. Adjust your pace to the terrain and overtake only where it is safe.
Withdraw at the checkpoint wherever possible and always tell race staff. Do not leave the course without informing the event team. Transport may not be immediate, and runners may need to wait until checkpoint operations allow collection.
Take on the 48-mile full island route or start at Les Fontaines for the coastal Marathon.
Round the Rock Half Marathon returns on Saturday 31 July 2027.
Questions not covered on the Race Day Information page? Email Paul.
