(Ιωνία) is a municipality
in the island and prefecture of Chios
. It is located in the southeastern part of the island, and has a land area of 48.272 km². Its population was 4,650 at the 2001 census. The seat of the municipality is in Kallimasia
(pop 930). Its largest town is Nénita (1,038). Other large towns are Tholopotámi (761) and Katarráktis (425).