On the northeast side of Corinthia, near the village of Agioi Theodoroi, is an important geological discovery, Sousaki volcano. It belongs to the same volcanic arc as the volcanoes of Methana, Aegina, Poros, Nisyros and Santorini. Its last eruption happened 2.5 million years ago but even today it presents some post-volcanic activity emitting hot gases.
The feature that makes it special is that it has no crater but it consists of two gorges and there are dozens of adits from which hot gases diffuse into the atmosphere. The impressive volcanic rocks take several curious formations and the smell of sulfur is strong. The gorges, depending on the season, have enough running water which is supplied from the nearby springs.
The volcano is located 180 meters above sea level and gives the visitor a unique hiking experience. At first you enter a steep, dry landscape but later you encounter (not all year round) active water springs and growing flora.
The hiking route inside the volcano is easy and the orientation implicit. The access to the start of the volcano is difficult, since the quality of the road is not good and especially in the end there is a dirt road, which, at some places, might be destroyed by the rain.