CASTRO MARIM provides a stark contrast to Monte Gordo. Today it is a dozy village, but for many centuries it held a position of key importance in the life of the Algarve. It nestles between two hills. Even though they are low hills they have a commanding view of the broad estuary of the river Guadiana which marks the frontier between the Algarve and the Spanish province of Andalusia.

Because of its location it was strategically significant in Roman times, much more so in the Middle Ages after the Moors had been expelled from Portugal but not from Spain, and when the Guadiana formed a buffer between the often warring kingdoms of Portugal and that large chunk of the Iberian peninsula known as Castile.

The larger of Castro Marim's two separate fortifications stands on the hill on the river side of the road winding through the village. You can drive almost right up to the front gate and then walk around within the battlements. You will see that there is a castle within a castle. The inner one is square with a cylindrical tower at each corner. In the 15th-century, this was the headquarters of the Order of Christ, the religious-military order which succeeded the Knights Templar in Portugal. Prince Henry the Navigator was a Grand Master of the order. Later, the castle was greatly expanded. In the 17th-century it was augmented by a second fortification, the Fort of São Sebastião, which stands on the other side of the village. The fort was built to strengthen Portugal's defences when it regained its independence after 60 years of Spanish subjugation between 1580 and 1640.

The area around Castro Marim is a protected natural reserve, rich in bird life. Its salt pans and marshes are feeding and breeding grounds for many species of waterbirds, including Black-winged Stilts, Avocets, Kentish Plovers and Little Terns. Flocks of several hundred flamingoes may be seen feeding in the pans out of breeding season. For directions and information about the species you can expect to see, ask at the office just inside the main gate of the castle.

See the official Castro Marim council site for more information (Portuguese language)