Erythrae or Erythrai later Litri, was one of the twelve Ionian cities of Asia Minor, situated 22 km north-east of the port of Cyssus, on a small peninsula stretching into the Bay of Erythrae, at an equal distance from the mountains Mimas and Corycus, and directly opposite the island of Chios. It is recorded that excellent wine was produced in the peninsula. Erythrae was notable for being the seat of the Erythraean Sibyl. The ruins of the city are found north of the town Ildırı in the Çeşme district of İzmir Province, Turkey.

Ionia was an ancient region on the western coast of Anatolia, to the south of present-day İzmir, Turkey. It consisted of the northernmost territories of the Ionian League of Greek settlements. Never a unified state, it was named after the Ionians who had settled in the region before the archaic period.