[2] Before the 2011 local government reform it was the seat of the municipality of Evrymenes.

[3] It is situated on the Aegean Sea coast, south of the mouth of the river Pineios, and at the foot of densely vegetated Mount Ossa.

The ancient city Eurymenae (also Erymnae) was situated near present Stomio.

The Greek Orthodox Monastery of Saint Demetrius, situated on the mountain slope above Stomio, was founded in the 6th century and rebuilt in its present form in the 12th century by Byzantine emperor Alexios I Komnenos.

Before 1927 Stomio was named Tsagezi (Greek: Τσάγεζι), deriving from the Turkish Çay ağzı which translates to "river mouth".