Lagoa das Sete Cidades, twin lakes in a volcanic caldera
Published on 09/09/2026 at 13:24 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Lagoa das Sete Cidades on São Miguel island in Portugal is a single freshwater lake that appears as two, a blue and a green expanse lying side by side on the floor of a volcanic caldera at the western end of the island. Set within the collapse caldera of the Sete Cidades volcano, it forms the largest surface freshwater lake in the Azores and gives the basin a distinct twin character that is visible from the shoreline and from viewpoints on the crater rim.largest lake in the Azores
The twin blue and green lake on São Miguel
The defining feature of Lagoa das Sete Cidades is its pair of adjoining water bodies known as Lagoa Azul and Lagoa Verde, which together form one continuous lake occupying much of the caldera floor on the western side of São Miguel.Lagoa Azul and Lagoa Verde In plan the water follows the shape of the basin, stretching for more than 4 km (2.5 mi) and reaching a maximum depth of around 33 m (108 ft) in its deeper soundings.area and depth of the lake
A low bridge carries the road across the narrow strait between the blue and green sectors, making the separation between the two arms evident to anyone walking or driving along the shore.bridge between the two arms On the northern side of the lake, the village of Sete Cidades sits close to the water, its houses and church gathered on gentler ground between the shoreline and the base of the crater slopes, while meadows and patches of forest occupy other parts of the basin around the twin lakes.village of Sete Cidades in the caldera
A vast volcanic caldera framing water and pasture
Lagoa das Sete Cidades lies within the collapse caldera of the Sete Cidades Massif, a stratovolcanic complex that dominates the western end of São Miguel in the Azores archipelago.Sete Cidades Massif The caldera is almost circular in outline and has an average diameter of about 5.3 km (3.3 mi), with walls that rise several hundred metres above the lake and surrounding fields to form a broad amphitheatre of crater slopes.dimensions of the caldera
Geologists describe the Sete Cidades volcano as a central volcano with a collapse caldera that probably began forming around 36,000 years ago through large, explosive eruptions that emptied magma chambers and caused the summit area to subside.formation of the Sete Cidades caldera Later eruptions within the caldera built smaller cones and depressions, which now host secondary lakes such as Lagoa de Santiago and Lagoa Rasa alongside Lagoa das Sete Cidades, giving the basin a layered volcanic landscape where crater walls, domes, smaller hollows and waterbodies share the same enclosed space.other lakes inside the caldera
Views from the rim and the parish of Sete Cidades
The civil parish of Sete Cidades lies within the municipality of Ponta Delgada and occupies part of the caldera floor around the northern sector of Lagoa das Sete Cidades, with the settlement clustered near the lake and agricultural land extending across flatter ground between the shoreline and the base of the crater walls.Sete Cidades parish Above the basin, viewpoints on the rim such as Miradouro da Vista do Rei look down across Lagoa Azul, Lagoa Verde and the village, framing water, fields and houses within the steep ring of the caldera.Miradouro da Vista do Rei
From these elevated points the contrast between the twin lakes becomes clear, with the blue and green sectors lying side by side and the road bridge marking the narrow link between them within the wider volcanic depression.twin branches of Sete Cidades Lake The surrounding slopes of the Sete Cidades volcano carry traces of past eruptions in the form of lava domes, scoria cones and other volcanic forms, giving visitors a sense of how volcanic processes have shaped the basin that now holds the lakes and settlement.volcanic setting of the lake
Visiting Lagoa das Sete Cidades: what travellers from Western Europe should know
- Lagoa das Sete Cidades lies on the western side of São Miguel island in Portugal, within the municipality of Ponta Delgada, and is reached by road from the island’s main town.
- The lake and village sit on the floor of a volcanic caldera surrounded by steep crater walls, and paths and minor roads in the basin involve gradients that reflect this enclosed terrain.
- Viewpoints such as Miradouro da Vista do Rei stand on the crater rim above the lake, reached by a mountain road that climbs from the lower parts of São Miguel.
- The official language is Portuguese and the currency is the euro.
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Frequently asked questions about Lagoa das Sete Cidades
Where is Lagoa das Sete Cidades located?
Lagoa das Sete Cidades lies in the caldera of the Sete Cidades volcano on the western side of São Miguel island in Portugal, within the municipality of Ponta Delgada.
What can visitors expect when they reach the lake?
Visitors encounter a twin-coloured freshwater lake known as Lagoa Azul and Lagoa Verde, with the village of Sete Cidades, pastures and forested slopes sharing the enclosed volcanic basin.
What makes Lagoa das Sete Cidades distinctive among Azores landscapes?
The combination of a large collapse caldera, the blue and green sectors of the lake, secondary crater lakes and the inhabited parish on the caldera floor gives Lagoa das Sete Cidades a distinctive volcanic amphitheatre character.
