It is situated on a hill 500 m. to the NE of the Sanctuary of Poseidon. The area was evened off and enclosed with a poros polygonal circuit wall. Inside the enclosed area were erected the Temple of Athena, a smaller temple to the north, and altars. A deep pit on the SE side of the temenos was used as a deposit for the Archaic offerings destroyed by the Persians. The oval peribolos to the NW of the temenos has been identified as the "Heroon of Phrontes".