Marathesium

Marathesium or Marathesion () was a town of ancient Ionia on the coast south of Ephesus, and not far from the frontiers of Caria, whence Stephanus of Byzantium calls it a town of Caria. It is also mentioned in the "Periplus of Pseudo-Scylax" and by Pliny the Elder. 
The town belonged to the Samians; but at some time they made an exchange, and, giving it to the Ephesians, receiving in return the Neapolis. 
It was a member of the Delian League since it appears in tribute records of Athens between the years 443/2 and 415/4 BCE.
Its site is located near Ambar Tepe, Asiatic Turkey.