Sousaki volcano, Dormant volcano in Agioi Theodoroi district, Greece
Sousaki volcano is a dormant volcanic system in Agioi Theodoroi district, Greece, with two gorges containing multiple vents that release hot gases year-round. The rock formations around these openings display clear signs of thermal activity and mineral deposits from centuries of gas discharge.
The volcano's last eruption occurred approximately 2.5 million years ago, creating new landmass in the Gulf of Megara. This geological transformation laid the foundation for the region's later development of port facilities and human settlement.
The volcano's presence has shaped the development of local industries, including the establishment of refineries and port facilities in the surrounding region.
Reaching this site involves walking on unpaved paths through olive groves, so sturdy footwear is necessary and caution is advised due to gas emissions. Check local conditions before visiting, as weather can affect accessibility and comfort at the vents.
The volcanic system continuously releases gases composed primarily of carbon dioxide along with smaller amounts of methane and hydrogen sulfide. This ongoing thermal activity is what makes the site an unusual example of a geothermal phenomenon in southern Greece.
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