Cytherus

Cytherus or Kytheros (Ancient Greek: Κύθηρρος[1] or Κύθηρος), also known as Cytherum or Kytheron (Κύθηρον),[2][3] was one of the twelve cities of ancient Attica, and afterwards a deme. Pausanias states that the nymphs of the river Cytherus in Elis were called Ionides from Ion, the son of Gargettus, when he migrated from Athens to Elis.[4]

The site of Cytherus is located near modern Pousi Kaloyerou.[5][6]
References

So in inscriptions
Strabo. Geographica. ix. p.397. Page numbers refer to those of Isaac Casaubon's edition.
Harpoc., s.v.; Suda, s.v.; Phot., s.v.; Stephanus of Byzantium. Ethnica. s.v.
Pausanias. Description of Greece. 6.22.7.
Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 59, and directory notes accompanying.

Lund University. Digital Atlas of the Roman Empire.

This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Attica". Dictionary of Greek and Roman Geography. London: John Murray.