Artificial port of the VI or V century BC.
See:
- https://en.wikipedia.org/wiki/Motya
- Lorenzo Nigro, Before the Greeks. The earliest Phoenician settlement in Motya. Recent discoveries by Rome «La Sapienza» Expedition, in: Vicino Oriente XVII (2013), pp. 39-74 - http://www.lasapienzatojericho.it/SitoRivista/Publicazioni/VO%20XVII/Vicino%20Oriente%20XVII_Contenuti%20Sito/PDF_Autori/VO_XVII_039-074_Nigro.pdf