So they resolved in their council that if the Persians held off through that day from giving battle, they would go to the Island.Several streams flow north or northwest from Cithaeron, and unite eventually form the small river Oeroe. Between two of these there is a long strip of land, which is perhaps the nh=sos; but it is not now actually surrounded by water, as Herodotus describes it. This is ten furlongs distant from the Asopus and the Gargaphian spring, near which their army then lay, and in front of the town of Plataea [23.2667,38.2] (Perseus) Plataea.

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.

To that place then they planned to go so that they might have plenty of water for their use and not be harmed by the horsemen, as now when they were face to face with them; and they resolved to change places in the second watch of the night, lest the Persians should see them setting forth and the horsemen press after them and throw them into confusion.

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; for these were cut off from them on Cithaeron.