Água de Pau Massif is a stratovolcanic complex, located in the central part of the island of São Miguel, in the Portuguese archipelago of the Azores.

[1] Until about 5000 years ago, activity in the caldera created several lava domes on the northern and western flanks.

[5] On the flanks of the massif is the Ribeira Grande Graben, a tectonic structure oriented northwest-southeast, in addition to other regional fractures and radial faults that formed other scoria and pumice cones, or lava domes.

[5] The stratigraphy of the Água de Pau Massif is complex, caused by a diverse volcanic activity over a period dated to 200,000 years.

[4][6] Among the various deposits Fogo A, which dates to roughly 5000 years, corresponds a clear stratigraphy of the island of São Miguel.