The peninsula of Methana is made of lava domes and lava flows. Volcanism began in the late Tertiary or early Quaternary. The most recent activity has been at Kameno Vouno, on the Northwest part of the peninsula. There was an explosive eruption at this vent in 258 BC. The eruption also produced a dome and lava flows. The dome has a crater about 100 m in diameter and 25 m deep. The dome was intruded by radial fissures. The flow is about 1,250 m long and about 150 m thick near the vent and 70-80 m thick near its terminus. The flow reached the coast and extended the shoreline by 500 m. This eruption was recorded by Strabo in his "Geographica." An eruption was suspected in August of 1922, but not confirmed. The rocks at Methana range from basalt to rhyodacite in composition. A spa at Methana features hot sulphurous and saline springs.

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