balise des Morées

Balise des Morées is the oldest maritime navigation structure in the Loire estuary, standing on a rocky shoal at the entrance to the port of Saint-Nazaire. This stone tower, shaped like a truncated cone and painted green with the word "MOREES" in white letters, has been guiding ships toward Nantes for well over two centuries.

Where does this structure come from?

The tower was built in 1777 to plans by engineer Groleau, funded by Nantes merchants who depended on safe passage up the Loire. It is the first permanent stone navigation structure of its kind ever erected in France, and it still stands on its original spot. In 1893 the tower was raised to accommodate a light, and in 1935 it switched to propane-powered illumination.

Why does this site matter for lighthouse history?

Around 1890-1893, the Morées beacon served as a testing ground for France's lighthouse and beacon service. Engineers trialed an automated acetylene lighting system here, and the results surprised even them: the light ran unattended for more than 150 consecutive days and nights without any human intervention. That experiment at Morées helped push forward the automation of maritime lighting in France, paving the way for unmanned lights and buoys elsewhere along the coast.

What will you actually see?

The beacon sits on a rock in the middle of the estuary's current, so there's no way to walk up to it — it's a structure you view from the shore or from the water. Its distinctive green, truncated-cone silhouette and bold "MOREES" lettering stand out against the flat, open landscape of the Loire's mouth. It's a quiet but striking feature of Saint-Nazaire's maritime scenery, a city otherwise dominated by its massive shipyards and industrial waterfront.

How do you get there and where's the best view?

The best vantage points line the quays and seafront promenades of Saint-Nazaire, which offer sweeping views over the Loire estuary. For a closer look, estuary boat tours depart from the port and are a popular way to explore this stretch of coast — combining a view of the beacon with the shipyard skyline and the Saint-Nazaire–Saint-Brévin bridge. Bring binoculars, since the beacon sits some distance from shore.

When should you visit?

The tower is visible year-round, but spring and summer offer the best conditions for a comfortable stroll along the quays or a boat trip on the estuary. The tower's bright green paintwork stands out best on clear days against the blue of the water and sky.

Why is it worth seeing?

Balise des Morées is more than a picturesque landmark — it's a living monument to French maritime engineering history. Listed as a historic monument, it combines an active navigational role with heritage dating back to the 18th century. For anyone interested in maritime history or coastal architecture, it's a rare case of an original 18th-century structure surviving in near-original form to this day.

Frequently asked questions

Can you go inside Balise des Morées? No. The tower stands on a rock in the estuary's current and isn't open to visitors — it can only be viewed from outside, either from shore or from a boat.

How old is the structure? It was built in 1777, making it the oldest permanent stone navigation structure of its kind in France. It was raised in 1893 to add a light.

Is Balise des Morées a protected monument? Yes, it has been listed as a French historic monument since November 22, 2011.

What's the best way to see it? The best views are from the quays of Saint-Nazaire or during a Loire estuary boat tour — from land it's only visible from a distance, given its position on a rocky shoal in the middle of the river.