Castle of Sancti Petri

The Castle of Sancti Petri (Castillo de Sancti Petri) stands on a small island at the mouth of the Caño de Sancti Petri, the sea channel between San Fernando and Chiclana de la Frontera, about 1.8 km off the Sancti Petri marina. You get there by boat from the Sancti Petri or Gallineras marinas, or by kayak, and then visit on your own for 5 € or with a guide for 10 €. Its watchtower dates from 1610 and its walls from the 18th century; the island is linked by tradition to the ancient temple of Hercules. It suits families and anyone happy to combine a short boat trip with a ruin and a view; skip it if you get seasick or want a full-size castle.

Quick facts

• Names: Castillo de Sancti Petri, also Castillo Sancti Petri; in English often Sancti Petri Castle. The island is the islote de Sancti Petri.
• Where: islet at the southern mouth of the Caño de Sancti Petri, off Punta del Boquerón and the Playa de la Barrosa. It belongs to San Fernando, after a 2005 court ruling settled a dispute with Chiclana de la Frontera (Wikipedia).
• Coordinates: 36.3799, -6.2201.
• Built: watchtower in 1610; walls and the rest of the fort in the last third of the 18th century. A lighthouse was fitted to the tower in 1918.
• Restored: works finished in March 2010, when it opened to the public.
• Protection: Bien de Interés Cultural, as a castle under the general decree of 22 April 1949.
• Entry: 5 € unguided, 10 € guided, boat or kayak extra (checked November 2026, Andalusia tourism board).

Access and parking

By boat: the Andalusia tourism board lists three ways over: a boat crossing from the Puerto Deportivo de Gallineras in San Fernando or from the Puerto Deportivo de Sancti Petri in Chiclana, a kayak trip from the Sancti Petri marina, or your own boat. There is a landing pier on the island’s east side (OpenStreetMap). The boat and kayak fares are not included in the castle ticket.

To the Sancti Petri marina: the marina sits in the old fishing village of Sancti Petri, at the end of the CA-2134 road, in Chiclana (Andalusia tourism board). OpenStreetMap shows a bus stop called Poblado de Sancti-Petri by the marina and several small car parks around the village, plus street-side parking.

Seen from the shore: the castle is in full view from the Playa de la Barrosa and from Sancti Petri beach, so you can see it without going over.

What to expect

A compact fort that covers most of a small, low island. Its outline is irregular and only the square tower rises above the walls (Wikipedia). The whole thing is built in piedra ostionera, the local shelly limestone. The tower began as a lookout against Barbary pirates, one of the coastal watchtowers ordered under Philip II; its thick, sloping base and the remains of machicolations at the corners show it is older than the rest. In the 18th century the walls and batteries were added to stop enemy ships entering the channel or landing troops on the nearby beaches, working with three batteries on Punta del Boquerón. The French bombarded the castle during the siege of Cádiz in 1810–1812.

The ancient story is the big draw. The island is tied by tradition to the temple of Melqart, the Phoenician god the Greeks and Romans called Hercules, one of the most famous sanctuaries of the ancient world; the guided visit tells it, along with the history of the tuna fisheries and the defence of Cádiz (Andalusia tourism board). Be clear about what you will see, though: nothing of the temple stands, and there is no firm evidence that it stood on this exact islet rather than nearby, as the coastline has changed a great deal (Wikipedia). Bronze statues found by chance in the surrounding waters are in the Museum of Cádiz.

The 2010 restoration made the ruin safe to visit but is criticised: Wikipedia’s article notes that 18th-century graffiti were partly lost and that a concrete pier 55 m long was built. The castle also has a bar for drinks and food, and it is hired out for weddings and private events.

Prices and opening

From the Andalusia tourism board listing, checked November 2026:

• Unguided visit: 5 € for adults and children over 11; 3 € for children aged 5 to 11.
• Guided visit: 10 € for adults and children over 11; 5 € for children aged 5 to 11.
• Guided sunset visit: 13 € and 8 €, including the sunset at the castle and one drink (excluding spirits).
• Hours: unguided and guided visits daily from 10:00 until one hour before sunset, except Friday from 14:00; sunset visits start two hours before sunset.
• Boat and kayak crossings are paid separately.

The castle’s own site, elcastillodesanctipetri.com, could not be opened while checking; contact it by email at info@elcastillodesanctipetri.com before you go, as times depend on sunset and on the boats.

Accessibility and safety

Best time to visit

Spring and early autumn, on a calm day. The sunset visit is the most atmospheric, and the tourism board’s hours show the castle is open all week, but Friday visits start only at 14:00. Check the sea forecast: a windy day makes the crossing rough.

Nearby alternatives

• Playa de la Barrosa, 3.6 km away: Chiclana’s long sandy beach, with the castle in view offshore.
• Chiclana de la Frontera town guide, 7.9 km away: the town inland from the beach.
• San Fernando town guide, 9.8 km away: the town the island belongs to.
• Conil de la Frontera town guide, 16.4 km away: the white town and beaches further south.
• Cádiz Cathedral, 17.9 km away: the domed cathedral on the Cádiz sea front.

Distances are in a straight line from the castle.

FAQ

How do you get to the Castle of Sancti Petri?

By boat from the Sancti Petri marina in Chiclana or the Gallineras marina in San Fernando, by kayak from the Sancti Petri marina, or in your own boat. The crossing is paid separately from the castle ticket.

How much does it cost to visit?

5 € unguided, 10 € guided and 13 € for the guided sunset visit for adults, with lower prices for children aged 5 to 11 (Andalusia tourism board, checked November 2026).

Can you walk to the Castle of Sancti Petri?

The official access options are by boat, by kayak or by your own means; we found no official walking route, so do not try to wade or swim across.

Is this the Temple of Hercules?

The island is linked by tradition to the ancient temple of Melqart-Hercules, but nothing of it survives and historians have not proved it stood on this exact islet. The castle you see is from 1610 and the 18th century.

When is the castle open?

Daily from 10:00 until an hour before sunset, except Friday from 14:00, according to the tourism board in November 2026.

Sources and freshness