Forte de Santa Maria da Arrábida

Forte de Santa Maria da Arrábida is a 17th-century coastal fort in the municipality of Setúbal, Portugal, standing at the foot of the southern slope of the Serra da Arrábida, southwest of the small bay of Portinho da Arrábida. Today it houses an oceanographic museum and is one of the most interesting monuments inside the Arrábida Natural Park.

Where is the Forte de Santa Maria da Arrábida?

The building sits on the northern coast, west of the mouth of the Sado River, in a dominant position above Portinho da Arrábida. Its coordinates are roughly 38.4738 N, 8.9829 W. From here the approach to the bay could be watched, which explains the choice of site.

What is the history of the fort?

The site had a religious meaning long before a military one. According to tradition, in 1250 a merchant from the British Isles named Hildebrando built a small hermitage dedicated to Our Lady, in thanks for surviving a shipwreck. Between 1539 and 1542, João de Lencastre, the first Duke of Aveiro, had an early convent built and handed it to the Spanish Franciscan friar Martinho de Santa Maria. Later dukes continued the works through the 16th and 17th centuries.

The fort itself dates from 1676 and was ordered by King Peter II. It was meant to strengthen coastal defence between the Fort of Santiago in Sesimbra and the Fort of Outão. The Marquis of Fronteira administered the project, and works were completed in 1749.

What is there today?

In 1978 the property became part of the Arrábida Natural Park and was classified as a Property of Public Interest. Extensive conservation and restoration followed, and in 1991 the building was adapted as an Oceanographic Museum. A marine biology centre also operates on site, so the old walls now serve the study of the sea.

Why visit?

• Religious, military and scientific heritage combined in a single building.
• A setting within a protected park, between the hills and the Atlantic.
• Proximity to Portinho da Arrábida, one of the best-known coves in the region.
• A museum devoted to marine life, fitting for a place that has faced the ocean for centuries.

Frequently asked questions

Is it a fort or a convent? Both. A hermitage came first, then a Franciscan convent, and in the later 17th century a defensive fort was built.

When was the fort built? Construction began in 1676 and works were completed in 1749.

What is inside? The Oceanographic Museum, opened in 1991, and a marine biology centre.

Is it inside a protected area? Yes, the Arrábida Natural Park, which it has belonged to since 1978.

Before you go, check the museum's current opening hours, as they may vary by season.