Sete Cidades is one of the landscapes that most clearly shows how volcanic activity has shaped our islands. Here on São Miguel, at the western end of the island, a large volcanic caldera holds lakes, smaller volcanic landforms, pasture, forest and the village of Sete Cidades itself.
For visitors, the first encounter is often from above. From viewpoints around the rim, especially Vista do Rei, Lagoa Azul and Lagoa Verde appear far below, surrounded by the steep green walls of the caldera. But Sete Cidades is much more than a viewpoint. Its geology, lakes, walking trails and inhabited landscape make it one of the most interesting places for understanding São Miguel.
The Sete Cidades volcano and caldera
Sete Cidades is a central volcano occupying the western part of São Miguel. Its most striking feature is the large summit caldera, approximately five kilometres across.
The volcanic history is considerably more complex than the landscape might suggest. Scientific studies indicate that the present caldera developed through major eruptive phases over tens of thousands of years. The volcanic system has subsequently experienced numerous explosive eruptions inside the caldera as well as basaltic eruptions on its flanks and offshore.
Research into the last 5,000 years of activity has identified repeated eruptions associated with the Sete Cidades volcanic system. The most recent explosive activity inside the caldera occurred several centuries ago, around the time when settlement of the Azores was beginning.
This is an important distinction when describing Sete Cidades: the absence of an eruption in modern times does not make it simply an extinct volcano. It is part of the active volcanic environment that created São Miguel and continues to be studied by volcanologists.
Lagoa Azul and Lagoa Verde
At the bottom of the caldera lies Lagoa das Sete Cidades, the largest lake system in the Azores. It is divided into two connected bodies of water traditionally known as Lagoa Azul, the Blue Lake, and Lagoa Verde, the Green Lake.
Seen from the rim on a clear day, the contrast between them can be striking. The apparent colours vary with light, weather, reflections and the surrounding landscape, rather than being caused by the lakes containing fundamentally different coloured water.
The two lakes have also inspired one of São Miguel's best-known legends. In the traditional story, a princess and a shepherd fall in love but are forced to separate. Their farewell tears form two lakes: one blue like the princess's eyes and the other green like those of the shepherd.
The legend is part of the cultural identity of Sete Cidades, but the real story beneath the lakes is geological — a landscape built by repeated volcanic eruptions and subsequently transformed by water, vegetation and human occupation.
Vista do Rei
Vista do Rei is the classic introduction to Sete Cidades and one of São Miguel's best-known viewpoints. From the caldera rim, the view opens across Lagoa Azul, Lagoa Verde and the inhabited floor of the caldera.
Weather makes an enormous difference here. Clouds and fog can hide the lakes completely and then disappear surprisingly quickly. That variability is part of life in the Azores, so a cloudy first visit does not necessarily mean the view will remain hidden for the whole day.
Walking into Sete Cidades
One of the best ways to understand the scale of the landscape is to walk through it rather than only stopping at the viewpoints.
The official PR03SMI Vista do Rei – Sete Cidades trail begins at Vista do Rei and follows the southwestern side of the caldera before descending into the village. The official Azores trail network currently describes it as a linear route of about 7.5 kilometres, with an average walking time of around two hours and an easy difficulty classification.
Part of the descent can nevertheless be steep and slippery, particularly when conditions are wet. Appropriate footwear is sensible, and current trail information should always be checked before setting out because weather, maintenance or temporary restrictions can change conditions.
Another important route is the Mata do Canário – Sete Cidades trail, which follows a longer section of the volcanic landscape and provides extensive views over the caldera and different parts of São Miguel.
The village inside the caldera
Sete Cidades is not simply a geological attraction. It is also a living parish inside the volcanic landscape.
Descending from the rim changes the perspective completely. From the village, the enormous walls that looked like a frame around the lakes from above become the horizon. The lakeside, local roads, pastures and houses show the relationship between the natural landscape and generations of human occupation.
The Church of São Nicolau is one of the characteristic landmarks in the village, and the Environmental Complex of Lagoa das Sete Cidades provides information about the protected landscape, geology, water resources, flora, fauna and walking trails.
A protected Azorean landscape
Sete Cidades forms part of the São Miguel Nature Park and is classified as a Protected Landscape Area covering approximately 2,173 hectares.
Its importance extends beyond scenery. The protected area includes important habitats, endemic and native plants, birdlife and freshwater ecosystems. It is also recognised as a Ramsar wetland site and forms part of a geosite within the Azores UNESCO Global Geopark.
This combination of geology, freshwater, biodiversity and human land use is one reason Sete Cidades deserves more than a quick photograph from the crater rim.
How to experience Sete Cidades
If you are visiting São Miguel for the first time, it is worth seeing Sete Cidades at more than one level. Start from the higher viewpoints when visibility is good, then descend into the caldera and spend some time near the lakes and in the village.
If walking is part of your plans, the official trails offer a much better sense of the dimensions of the volcano and its relationship with the Atlantic coast. Conditions in the Azores can change quickly, so check the official trail information on the day of your walk.
Sete Cidades is sometimes presented simply as the place with the blue and green lakes. For those of us who live here in the Azores, however, it represents something broader: a landscape where the volcanic origins of the islands, freshwater ecosystems and everyday human life occupy the same caldera.
That is what makes Sete Cidades worth exploring rather than simply viewing from above.
Explore more of São Miguel
Sete Cidades is only one part of São Miguel's volcanic landscape. You can continue exploring the island in our guide to São Miguel, which will also be progressively updated as part of our new guide to the Azores.