The position was well adapted as an advanced post against invaders from the north, and furthermore guarded the road up the Asopus gorge into the Cephissus valley.
TRACHIS, a city of ancient Greece, situated at the head of the Malian Gulf in a small plain between the rivers Asopus and Melas, and enclosed by the mountain wall of Oeta which here extended close to the sea and by means of the Trachinian Cliffs completely commanded the main road from Thessaly.
From the Corinthian Gulf, at the confluence of the Asopus and the Helisson, whose sunken beds protected it on E.
Its military importance was recognized in 427 B.C. by the Spartans, who sent a garrison to guard the Trachinian plain against the marauding highland tribes of Oeta and built a citadel close by the Asopus gorge with the new name of Heraclea.