The Paleo-environmental reconstruction of the coastal sector of Kition Bamboula demonstrates that this area was an open bay that became separated from the Mediterranean sea. The evolution has been basically led by relative sea-level variations, tectonic mobility and variations in sediment supply. Coupled with archeological data, the cores stratigraphy emphasizes six distinct environments of deposition since 3000 years B.P. (A) Around 3000 BP, an open marine embayment is characterized by a calm sedimentation. The influences of external dynamics are mitigated by the presence of a Postdoma reef barrier. This first type of environment was used as a mycenian harbour between XIV-XIIIth centuries BC. (B) Between 2000 BP and 1600 BP, a lagoon is characterized by marine juvenile molluscs dying quickly in this environment that corresponds to a «leaky lagoon». The initial marine embayment was then partially closed by a spit and used as a Phoenician military harbour. (C) After 1600 BP, an hypersaline lagoon with sporadic dessication, formed as the consequence of the almost complete closure of the lagoon which could be due either to tectonic uplift or sedimentary processes. Gypsum was formed by either subaqueous or interstitial crystallisation. Restricted connections with the open sea were discontinuous. Pelagic foraminifera were introduced during occasional marine floodings probably related to storms. (D) A re-opening of the coastal pan converted the sabkha into a brackish lagoon. This lagoon was used by Romans as a port. This re-opening might be linked to relative sea-level rise. (E) Finally, the lagoon was partially closed, transformed in marshland and described by travellers as the ancient harbour. (F) Since British colonization, an artificial filling-up of the coastal plain has transformed the quite steady paludal wetland into an urban complex.