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From Athens you drive for about 150km on the Athinon-Lamias Freeway to Arkitsa Port (exit Arkitsa) and then take the Ferry Boat from Arkitsa (about 40 minutes) to Aedipsos. View the fery’s schedule here: From Aedipsos take the road to Agiocampos (7km).
If you do not want to take the ferry you can drive from Athens to Chalkis and then from there to Aedipsos.