The Methana Peninsula is considered to be the product of earlier volcanic activity. Proof of this can be found in the kind of rock found on the peninsula as well as in the many craters that exist there.  The volcanic centre of Methana belongs to the volcanic arch that links the volcanoes of Sousakion, Egina, Poros, Belopoula, Karavi, Falkonera, Antimilos, Milos, Kimolos, Polibos Stroggilon, Despotikon, Spiridonisia, Antiparos, Christiana, Santorini, Kos, Nisiros, Alikarnasos and Patmos. This arch moves along a number of crevices the cracks in which caused the volcanic activity in the south Aegian sea. There were many volcanic eruptions during the third period - right after the formation of the Alps - which continued into the fourth period.

We find the remains of many volcanic erruptions on the peninsula. On the SE of the hill of Helona, in the locations Stravologos and Makrilogos, we find large craters.  We also find craters in Ano Mouska, in the village Kameni Hora, next to Agios Andreas, next to Zoodoxos Pigi, in Kipseli. Up to date thirty (30) volcanic cratershave been found scattered across the peninsula. C. Mitsopoulos started recording these findings in 1867. From the above-mentioned craters, the ones that were last active are those, which are at close proximity to the village Kammeni Hora. Proof of this is found in the metallic substance that remains as well as in the current morphology of the land (minimal erosion). Fougue admits that the eruption in Kammeni Hora is the one mentioned by Stravon, Obidios and Pafsanias.

     The exact date of this eruption is unknown. It is however estimated to have taken place between the years 277-240 BC. Today the volcano is considered inactive, as there has been no recorded activity for centuries.  The main crater of the volcano is on a conical summit (425 metres) northwest of the village Kammeni Hora. The emission of this crater forms a narrow stream that pours into the nearby sea.  The main crater is approximately 100 metres in diamÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ