Among the provincial road Pelopi – Ypsilometou, there are the impressive columnar lavas of Pelopi, which look like natural pillars, placed next to each other
Their creation is linked to the volcanic activity that occurred in the area, 21.5-16.5 million years ago and more specifically to the Lepetymnos volcano, the largest volcanic center of Lesvos.
The impressive geological structure is due to the rapid cooling of a lava flow, of dacite composition, that erupted from the volcanic structure of Prophet Elias.As the fluid material rose at low speed towards the earth’s surface, it cooled rapidly inside the volcano, causing multiple parallel fissure systems to develop throughout its volume.
Along these cracks, the rocks separated and formed impressive pentagonal or hexagonal prisms, which appear today and characterize the landscape of the area.