The northeastern side of Halkidiki has a long history which is mostly marked by the involvement of the inhabitants in the mining activity. More than 300 wells and approximately 200,000 square meters of ancient metallurgical waste are preserved in the area, commonly known as “skouria” (rust) from the overheating of minerals in furnaces that prove this fact.
Milos lies on the South Aegean volcanic arc. The volcanos of the island may be dormant today, however there are several indications on the island that its surface communicates with the interior of the Earth. These are indications that can be met in all volcanic arcs with signs of recent or older volcanism.
Nissiros volcano emerged from the sea 200,000 years ago to form a cone of land. As it continued to erupt over the following years, molten fragments of stone were released in the atmosphere, only to cool down again as they fell on the ground to eventually form layers of volcanic ash.