Wikipedia
Kalaureia
Kalaureia or Calauria or Kalavria is an island close to the coast of Troezen in the Peloponnesus of mainland Greece, part of the modern island-pair Poros.
Strabo describes the coastwise journey along the Hermionic Gulf:
"The gulf begins at the town of Asine. Then come Hermione and Troezen; and, as one sails along the coast, one comes also to the island of Calauria, which has a circuit of one hundred and thirty stadia and is separated from the mainland by a strait four stadia wide."