“…The study area is divided into the following subareas, based on bottom morphology: (i) Elefsis Bay, connected with the adjacent sub-basins through two narrow and shallow straits, located in the west (Megara strait) and the southeast (Keratsini strait), (ii) eastern Saronikos basin that is further divided into the inner Saronikos to the north and the outer Saronikos to the southeast, from where the gulf connects with the Aegean Sea, and (iii) western Saronikos Gulf (Table S1). The network of monitoring stations (S1, S2, S3, S7, S8, S11, S13, S16, S18, S43) as implemented in the framework of the action 'Monitoring of the Saronikos Gulf ecosystem under the influence of the Psittalia sewage outflow' [21], as well as the sources of pollution (1)(2)(3)(4)(5)(6)(7)(8)(9), are displayed in Figure 1b. Five trace elements were chosen to set up and validate a water quality model configuration: cadmium (Cd), lead (Pb), nickel (Ni), copper (Cu), and zinc (Zn).…”