The volcanic Graciosa island covers an area of 60.84 square kilometres. The highest elevation is a 1.6 kilometres wide caldera (408 m) in the southeastern part of the island.
Portugal 2017, Furna do Enxofre.
The stamp was issued in the series "Geoparque Azores".
Furna do Enxofre is a 194 metres wide and 40 metres high volcanic cave, it features stalactites and a sulphurous, cold water lake of 130 metres in diameter.