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Guildo Castle – Quatre Vaux Beach loop from Saint-Cast-le-Guildo

Routes

Bike touring routes & trails

Guildo Castle – Quatre Vaux Beach loop from Saint-Cast-le-Guildo

Moderate

4.3

(11)

riders

Guildo Castle – Quatre Vaux Beach loop from Saint-Cast-le-Guildo

02:08

32.8km

380m

Cycling

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 26, 2026

Tips

Includes a segment that goes up or down a series of steps

You may need to carry your bike.

After 477 m for 12 m

Waypoints

Start point

Bus stop

Get Directions

983 m

Saint-Cast

Highlight • Settlement

Saint-Cast is rightly considered one of the most beautiful coastal towns in northern Brittany: one and a half kilometers of white sandy beach on the Grand Plage (or Plage des Mielles) and everything that makes a seaside resort, in the district of La Garde, winding lanes steeply on the hillside in L'Isle , boat harbor, beach boulevard, shops and restaurants of all kinds.

Translated by Google •

Tip by

3.07 km

View! Pointe de la garde

Highlight • Other

11.4 km

View of Gilles de Bretagne Castle from Pont René Pleven

Highlight • Viewpoint

From the bridge, enjoy the view of the ruins of the castle on the right bank of the Arguenon. In the 15th century, Gilles van Bretagne lived here, a poet and womanizer who lived a merry life, hence the expression "courir le guilledou" (to go on a woman hunt). But his brother, Duke Francis I of Brittany, suspected Gilles of plotting and had him imprisoned. Because he didn't die fast enough, he was then strangled. Before his death, however, Gilles subjected his brother to divine judgment, and the duke also died, tormented by remorse.

Translated by Google •

Tip by

12.3 km

Guildo Castle

Highlight • Castle

The ruins of the Château du Guildo rise above the mouth of the Arguenon.
The castle was once the property of Prince Gilles of Brittany, whom his own brother, Duke François I of Brittany, had imprisoned and murdered for quarrels over inheritance and prestige.

Translated by Google •

Tip by

16.8 km

Plage des Haas ⛱️ - ramp to go to the Îles des Ébihens 🏝️

Highlight • Beach

At low tide you can bike across the sea floor to the islands. Follow the harder sand along the water's edge and make sure to check the tide table in order to be back on the mainland latest 90 minutes after the lowest tide

Tip by

17.6 km

La Banche Beach

Highlight • Beach

Due to the extreme tidal difference at this part of the channel, the lovely beaches are only good for bathing a couple of hours around high tide. At low tide the firm sand allows to cross the bay and even walk out to the Ébihan islands.

Tip by

25.0 km

Quatre Vaux Beach

Highlight • Beach

A small cove-shaped beach open to oyster beds and bouchots. Magnificent !

Translated by Google •

Tip by

29.1 km

View of the Emerald Coast from Lower Saint-Cast

Highlight • Viewpoint

At the bottom of a basin that makes your calves creak as you leave, but it's worth the look!

Translated by Google •

Tip by

32.8 km

End point

Bus stop

Way Types & Surfaces

Way Types

18.4 km

9.06 km

2.19 km

1.63 km

1.22 km

237 m

131 m

< 100 m

Surfaces

24.6 km

6.82 km

868 m

407 m

114 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (60 m)

Lowest point (0 m)

Weather

Sunday 30 August

20°C

16°C

38 %

Additional weather tips

Max wind speed: 30.0 km/h

to get more detailed weather forecasts along your route

Comments

June 3, 2025,Runde von St. Cast-Le-Guildo nach St. Jacuts-de-la-Mer

A relatively short hike with several steep sections. St. Jacuts was deserted at the beginning of June, and would probably be overcrowded in the summer. But the views are very beautiful, especially from the top.

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Guildo Castle – Quatre Vaux Beach loop from Saint-Cast-le-Guildo

Saint-Cast

View! Pointe de la garde

View of Gilles de Bretagne Castle from Pont René Pleven

Guildo Castle

Plage des Haas ⛱️ - ramp to go to the Îles des Ébihens 🏝️

La Banche Beach

Quatre Vaux Beach

View of the Emerald Coast from Lower Saint-Cast

Nearby routes

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