The Island

Furthermore, they resolved that when they had come to that place, which is encircled by the divided channels of Asopus ' daughter Oeroe as she flows from Cithaeron, they would in that night send half of their army to Cithaeron, to remove their followers who had gone to get the provisions;

It is like an island on dry land because the river in its course down from Cithaeron into the plain is parted into two channels, and there is about three furlongs space in between till presently the two channels unite again, and the name of that river is Oeroe, who (as the people of the country say) was the daughter of Asopus.

So they resolved in their council that if the Persians held off through that day from giving battle, they would go to the Island.

"Then I saw Phaedra, and Procris, and fair Ariadne daughter of the magician Minos, whom Theseus was carrying off from Crete to Athens, but he did not enjoy her, for before he could do so Artemis killed her in the island of Dia on account of what Bacchus had said against her.

Furthermore, though the inhabitants of the island were hostile to me, and the Great King, while outwardly reconciled, was really in an ugly mood,

I calmed and appeased both parties by assisting the King zealously and by treating the islanders justly.