The island owes its existence to the fusion of four volcanoes, the largest and most active of which is the Fossa, which stands 391 m high and is made of red rock. Although the last eruption dates back to 1890, the volcano has never ceased to give signs of its vitality, and to this day various phenomena are manifested: steam vents, called fumarole, off the top and from below the water’s surface along with therapeutic, sulphur-rich mud.
The island owes its existence to the fusion of four volcanoes, the largest and most active of which is the Fossa, which stands 391 m high and is made of red rock. Although the last eruption dates back to 1890, the volcano has never ceased to give signs of its vitality, and to this day various phenomena are manifested: steam vents, called fumarole, off the top and from below the water’s surface along with therapeutic, sulphur-rich mud.
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