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THE INTERTIDAL

A unique series of running adventures across Jersey's low-tide foreshore, linking iconic landmarks and coastal fortifications. With the third-largest tidal range in the world, these point-to-point challenges offer the rare chance to run where very few feet have been before.

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A Race Series Like No Other

Tidal Range

Over 12m Spring Tides

Terrain

Exposed Foreshore & Reefs

Cut-off

Set by the incoming sea

Format

Point-to-Point Low-Tide Trail

Location

Jersey, Channel Islands

Navigation

Landmark-to-Landmark

What Is The Intertidal?

The island of Jersey experiences the third-largest tidal range in the world, exceeding 12 metres on Spring Tides and receding up to two miles from the southeast coast.

The Intertidal is a running series unlike any other, taking place exclusively in the fleeting window of time when the seabed is exposed.

Runners navigate across dynamic coastal surfaces and collect iconic landmarks along the route. Expect mixed sand, rocky reefs, tidal channels, and conditions that demand calm decision-making and respect for the ocean.

We don't create a cut-off, the sea does.

Iconic Coastal Landmarks

Every event links a sequence of historic Jersey fortifications and tidal waypoints.

Routes vary per event, visiting historic 18th-century towers, tidal castles, and coastal reefs.

Elizabeth Castle
Elizabeth Castle

A signature landmark and a turning point for many runners mentally.

Elizabeth Castle

A signature landmark and a turning point for many runners mentally.

Elizabeth Castle

Jersey's headline act for good reason: the castle is one of the Island's most important historic fortresses: a granite stronghold built from the late 16th-century on a tidal islet in St Aubin's Bay, guarding the approaches to St Helier and embodying over 400 years of military history. You'll approach ia the causeway with the castle cut off twice daily by the tide.

Green Island
Green Island

A classic Jersey waypoint with views that feel earned.

Green Island

A classic Jersey waypoint with views that feel earned.

Green Island

Also known by its older name La Motte - Green Island is a small tidal islet off Jersey's southeast coast, notable for its rich prehistoric archaeology, its shifting relationship with the shoreline, and its distinctive geology. It sits just offshore from St Clement and becomes completely surrounded by water at high tide.

Havre des Pas
Havre des Pas

Back into civilization briefly, then straight back out again.

Havre des Pas

Back into civilization briefly, then straight back out again.

Havre des Pas

Havre des Pas is a Victorian and Edwardian seaside district just a short walk from St Helier town centre. The distinctive blue and white coloured swimming pool is a late-19th-century tidal lido, built in 1895 and is one of the earliest purpose-built seaside bathing pools in the British Isles. Its circular granite tower, sweeping terraces, and position on a natural rocky platform make it both architecturally distinctive and historically significant.

Icho Tower
Icho Tower

A solitary marker and a proper moment to take stock before the next stretch.

Icho Tower

A solitary marker and a proper moment to take stock before the next stretch.

Icho Tower

A compact, granite Martello-style tower built in 1810-1811 on a tidal reef in St Clement's Bay, forming part of Jersey's coastal defenses during the Napoleonic Wars. Its isolated position, round profile, and military purpose distinguish it sharply from the areas shifting sands, reefs, and channels that historically made the southeast coast vulnerable to landings.

Seymour Tower
Seymour Tower

A Jersey icon out on the flats. Big skies, big exposure.

Seymour Tower

A Jersey icon out on the flats. Big skies, big exposure.

Seymour Tower

Seymour Tower is one of Jersey's most distinctive coastal fortifications: a square-built 18th-century defensive tower standing alone on a tidal outcrop nearly 2 km offshore, raised in the aftermath of the 1781 French invasion attempt. Its isolation, military purpose, and position within one of the world's largest intertidal zones makes it both historically significant and geographically dramatic.

St Aubin's Fort
St Aubin's Fort

One last coastal target before the finish pull into St Aubin's.

St Aubin's Fort

One last coastal target before the finish pull into St Aubin's.

St Aubin's Fort

St Aubin’s Fort is the exclamation mark at the end of the bay. Built to defend approaches and assert control of the waterway when coastal security mattered as much as any road. Close enough that you can see the finish but far enough away that the shore is not yet in reach. The final stretch takes you into the picturesque fishing village of St Aubins where your journey will end.

How It Works

  1. 1
    Signup for an event to receive your confirmation and event guide.
  2. 2
    On race day, start within the dedicated low-tide window as the sea recedes.
  3. 3
    Navigate between the required coastal landmarks in sequence and collect your proof of passage.
  4. 4
    Beat the incoming tide to reach the finish line for validation and celebration.

Safety is our priority

Tidal conditions can change quickly. Participants are expected to make conservative decisions at all times and strictly follow race crew instructions.

Read the safety guidance

Who It's For

Are you ready for the challenge?

  • Those looking for something completely new and unique
  • Runners comfortable with varied terrain and changing footing
  • People who enjoy a challenge and can stay composed under pressure
  • Anyone happy to self-manage pace, kit, and route choices between key points
  • Not for you if you want a closed-road course, constant aid stations, or predictable conditions.

Ready to Take on The Intertidal?

Explore our upcoming events and secure your spot on the start line of one of the world's most unusual races.

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