Nea Kameni with its different lava domes and flows seen the W.

On the way up to the craters formed in 1928. Sparse vegetation is growing on the stony terrain.

Deep fractures cut through the Mikri Kameni lava dome (1570-1573).

Fumaroles and tourists on the walls of Georgios crater.

View from Mikri Kameni across the caldera towards the Skaros shield. The houses of Imerovigli are seen on top of the caldera rim.

Sulfur crystallizes on the fumaroles inside georgios crater.

Mikri Kameni (the green vegetated cone) surrounded by the 1928 lava flows.

A patch of blocky lava with a small hydrothermal lake occupy the vent of the 726 explosive eruption on Palea Kameni.

Agios Nikolaos bay with its warm underwater iron spring waters on Palea Kameni.

Swimmers in one of the warm water spring bays. The green color is due due to iron in reduced state Fe2+, mainly colloidal pyrite. When they mix up the water, the iron on and near the surface is oxidized to Fe3+.

Graben fractures on top of Palea Kameni. 

Dafne crater from the 1925-1926 eruptive activity.

Flows from the 1928 eruption encircle a small bay, which now serves as tourist boat harbour.

Sostis' dog, our guide on the volcano, observes the Reck lava dome (right on picture) from a vantage point...

Georgios crater active in 1866 and 1941. Today, several hot fumaroles are active along its walls.

Channel between Palea and Nea Kameni (right). The now submerged small volcanic island "Maionisi" that appeared on 10 May 1866 is visible as the twin reef in the left. Warm iron-rich water (green-colored) is carried from a bay at Nea Kameni by the currents.

Investigating hot spots and fumaroles on the ground.

Felix F. standing next to a large pumice bomb ejected in 1928.

Large dense bomb from the 1866 eruption near the Georgios crater.

The "youngest land in Greece" has just had its 54th birthday. A black patch of blocky lava had filled the shallow crater created during the last eruption in 1950.

Warm iron-rich spring bay at the coast of Nea Kameni. Bubbles (mainly CO2) can be seen rising at some places.