Photo by Els Slots.

Mértola is part of the Tentative list of Portugal in order to qualify for inclusion in the World Heritage List.

Mértola is located in the rocky landscape of the eastern Alentejo on a hill above the mouth of the Río Oeiras in the Río Guadiana. Due to its strategically favourable location, Mértola was an important river port and trading hub in Classical Antiquity and the period of Umayyad conquest. The most significant historical building is the Church of Nossa Senhora da Anunciação built in the 12th-century as a mosque.

Map of Mértola

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The coordinates shown for all tentative sites were produced as a community effort. They are not official and may change on inscription.

Community Reviews

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Germany - 05-May-23 -

Mértola (T) by Nan

Mértola is a charming town in the Alentejo region of Portugal, with a rich and varied history dating back to the Phoenicians, Romans, Visigoths and Arabs. Its strategic location on the River Guadiana gave it a maritime past. It continued to be a port until the 18th century, and the submerged wharf from that period can still be seen today.

The town lies at the foot of a medieval castle, and there are several archaeological sites in the town, including one at the southern end and one under the castle walls, where the ruins of a Late Antique baptistery have been discovered. The most impressive building in Mértola, however, is the former mosque, built during the Islamic period and later converted into the Church of Nossa Senhora da Anunciação. It's believed to be the only mosque in Portugal from this period that still retains its original features, such as the mihrab and horseshoe arches. The town's picturesque cobbled streets and white houses add to its charm.

During my visit, I had to explore the city's sites before they opened as I was catching an early bus. Nevertheless, I enjoyed the experience and took some nice pictures of the town, which was still covered in clouds (pictured). The best view of Mértola is from the main bridge over the Guadiana River (agree with Clyde).


Mértola was originally slated for World Heritage status in the near future, but according to this website, the Portuguese government seems to have prioritised other tentative sites, including Vila Viçosa.

Personally, I think Vila Viçosa is a weaker candidate than Mértola. Although I don't consider Mértola to be an exceptionally strong candidate, its long and varied history, including Phoenician, Roman and Arab traces, with tangible Arab heritage remaining, makes a more compelling case than the ducal Renaissance town of Vila Viçosa. However, both towns are overshadowed by nearby Évora, which also dates back to Roman times and has a significant amount of Roman remains.

The main differences between Mértola and Évora are Mértola's historic function as a port and its remarkable Arabic history, culminating in the mosque. Although it occupies a distinct niche, I'm not entirely convinced that this is enough to warrant inscription on the World Heritage List.

How to get there

Occasional buses run from Monte Gordo to Lisbon and back, with a stop in Mértola. You can connect in Beja to other destinations like Évora, Elvas, and Vila Viçosa. You can also cross the border into Spain from Monte Gordo/Faro.

The bus stop in Mértola is located at the Northern roundabout in front of the kiosk.

During my trip from Évora to Monte Gordo via Beja, the bus was severely delayed in Beja, to the point that I thought it wouldn't arrive. However, it eventually did, and I was dropped off at the roundabout in Mértola late at night. Unfortunately, the return bus to Lisbon ran early next day (or really late in the evening), so I had to start my sight at sunrise.


Malta - 17-Aug-20 -

Mértola (T) by Clyde

I visited this tentative WHS in July 2020. First of all, due to the amount of historic points of interest and limited opening hours (as well as the different lighting for photography), I'd definitely suggest staying over at least for 1 night.

Mertola is located on a hill over the Guadiana River, which is a very important life source for many birds (I unexpectedly managed to spot a pair of Golden Orioles near the river banks), fish (with as much as 6 endemic species of river fish) and fauna. Although Mertola is known as the national hunting capital of Portugal, there are a number of nature and biodiversity conservation programmes and initiatives going on such as the reintroduction of the Iberian lynx, even though its habitat clashes with locals' driving/speeding habits. The town owes much of its historical importance to the Guadiana River. Its strategic location made it an important fluvial commercial port between Alentejo and other parts of Al-Andalus (Arab Hispania) and Northern Africa, from the Roman times (the GR15 Great Guadiana Hiking Route passes through the Via Romana) up until the Umayyad conquest of Hispania. In the early Middle Ages, the Guadiana River lost most of its importance which led to the decline of the port of Mertola. However, the discovery and modern exploration of lode mining (the process by which gold is extracted directly from underground ores) in the Serra de Sancto Domingos, gave new importance to the river and town.

Mertola's main church, the Church of Nossa Senhora da Anunciação or Igreja Matriz, is the only medieval mosque to have survived this period in Portugal. It is an 11th or 12th century Almoad mosque with 4 arched doorways capped by a mirhab. In the area between the church and the Mertola castle, there's an interesting archaeological area, where works are very much still in progress. During my visit, I had a lovely chat with some of the local archaeologists on duty who kindly offered to accompany me around the uncovered area and provide some context to what I was seeing. Obviously, this was a highlight during my visit as the current findings are far from intact and I would have definitely missed some of the details. Even if you visit outside opening hours, you'll still be able to get a reasonable overview and a glimpse of the 6th century baptismal font.

That said, the most important findings are the mosaic fragments depicting a combination of mythological creatures, hunting scenes from ancient times with birds and felines, and Christian symbolism. My favourite fragments portrayed the mythological struggle between Good and Evil, adapted to the Christian liturgy of the period. The Classical hero Bellerophon, in the figure of Saint Michael or Saint George, kills Chimera, the demonic monster with the serpent's tail that spits fire from its three heads. The image of Chimera is almost intact but as for Bellerophon, only the head of his horse Pegasus is visible and the lance that pierces the monster. The rest of the excavations cover (or rather uncover) the Barrio Islamico.

An interesting area of Mertola is the yellow painted district (as opposed to the whitewashed rest of town) of Alsafir, still mostly inhabited by Muslim artisans. The nearby small museum of local Islamic art was unfortunately closed during our visit but it might be worth visiting when open. From here, I explored the area around Torre do Rio and the remains of a granary. The River Tower, next to the ancient river port and controlling one of the most important entries into the city, was a prominent link in the defence system of the ancient late Roman city. An access route inaugurated on a solid series of arches allowed this armour tower to connect with the interior of the city walls. Most probably, also judging by the remains on the opposite side of the river, this port defence system was completed by an iron chain, thrown across the river, that controlled navigation.

The best viewpoints to gaze at the town of Mertola are from the modern bridge at sunset or early in the morning from the opposite river bank at Alem Rio (which offers limited but excellent opportunities for parking/accomodation). I'm really glad I visited this tentative WHS and I think it has the potential to be inscribed.

Els Slots

The Netherlands - 26-Jul-20 -

Mértola (T) by Els Slots

Mértola, a possible WHS for 2022 or 2023, was the last stop on my short trip by rental car through the north and center of Portugal last month. The town is located just like Vila Viçosa in the Alentejo region. I drove there via a quiet back road, where you’re allowed to drive 90 kilometers per hour. The largely uninhabited landscape is pretty with its cork oaks and olive trees, with some cows here and there that apparently can tolerate the heat.

On the last kilometers before Mértola I suddenly saw a remarkable warning sign: beware of devils? Of bats? A bit further on there was a textual  explanation: the animal head represents a Lynx. It turns out that Iberian lynxes have been reintroduced in this area in recent years. The life of one of those already ended under a car and local authorities apparently wanted to prevent further damage. Not that it kept the Portuguese drivers from speeding though.

Mértola used to be an important river port. Already in ancient times it was inhabited by Phoenicians, Carthaginians and Romans. They took advantage of its strategic hillside location on the navigable Guadiana River. It held this position when the Moors conquered the Iberian Peninsula in the 8th century. The Muslims built a castle and a mosque there. For a long time, Mértola was an independent Islamic empire that had to defend itself against Arab and Christian neighbors.

The mosque dates from the 12th century and later was converted into a Christian church, keeping its original architecture. I visited the town on a Sunday afternoon, unfortunately then (and on Mondays) the castle and the mosque-church are closed. There are also excavations to be seen from the Roman and Arab times. From behind the fence they looked very limited, there are a few fragments of mosaics which might be of interest.

The area reputedly is also very good for hiking, but in mid-July when I visited it was much too hot for that. Even at 6pm, it still felt like walking into a suffocating blanket. I spent the afternoon at the pool of my hotel, from where I had a good view of life on and along the river. I saw a man walking his goats and a single speedboat raced across the water. Freight transport no longer seems to be using this river.

In the absence of other entertainment I joined 7 Portuguese at 10am the next morning to make a one hour boat trip on the river. That was of course much too late to see any activity of birds or anything else. But we did see a few overjoyed pigs that were allowed by their owner to dive into the river. The best thing about the trip on the river however was the approach to the town of Mértola, with its imposing castle that protrudes above everything. In earlier times, skippers must have really had the feeling that they arrived at an important place.

Read more from Els Slots here.

Full Name
Urban landscape - Urban continuity
2017 Added to Tentative List

Unesco Website: Mértola

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Mértola (T)
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