Syia or Suia (Ancient Greek: Συῒά), also Syba (Σύβα), was a maritime town of ancient Crete. It was located on the south coast of Crete and functioned as the harbour of Elyrus. According to the Stadiasmus Maris Magni, written during Roman times, the town was located 50 stadia to the west of Poecilassus, situated on a plain. It probably existed as late as the time of Hierocles (6th century), though now entirely uninhabited.
Robert Pashley, visiting in the 19th century, found remains of the city walls as well as other public buildings, but not more ancient than the time of the Roman Empire. Several tombs were found, as was an aqueduct.
Syia flourished in the Roman and the 1st Byzantine period. There are Roman ruins and three large Palaiochristian Basilicas. Syia had set up monetary union with Yrtakina, Elyrus, Lissus, and Tarrha. The city also participated in the Koinon of the Oreians. It seems that the Saracens destroyed the city.
- Stephanus of Byzantium. Ethnica. Vol. s.v..
- Stadiasmus Maris Magni §§ 321-322.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 60, and directory notes accompanying.
- Lund University. Digital Atlas of the Roman Empire.
- Robert Pashley, Travels, vol. ii. p. 100.