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]