Brewer's Dictionary of Phrase and Fable/Abaton
Ab′aton. (Greek α not; βαίνω, I go.) As inaceessible as Abăton. Artemisia, to commemorate her conquest of Rhodes, erected two statues in the island, one representing herself, and the other emblematical of Rhodes. When the Rhodians recovered their liberty they looked upon this monument as a kind of palladium, and to prevent its destruction surrounded it with a fortified enclosure which they called Abaton, or the inaccessible place. (Lucan speaks of an island difficult of access in the fens of Memphis, called Abăton.)