THYSSUS(Θύσσος), a town of Chalcidice in Macedonia, situated on the W. or S. side of the peninsula of Acte or Mt. Athos. Its exact position is uncertain, but it appears that Thyssus and Cleonae occupied the central part of the W. or S. coast of the peninsula, and that one of them may be placed at Zográfuor Dhokhíari, and the other at Xeropotámi. (Hdt. 7.22; Thuc. 4.109, 5.35; Scylax, p. 26; Strab. 7. p. 331; Plin. Nat. 4.10. s. 17; Leake, Northern Greece, vol. iv. pp. 149—152.)