Thus, the analysis of the borehole data, seismic data, and biostratigraphy confirmed that the Tertiary sediments consist of fluvial- deltaic–lacustrine sediments deposited in the isolated South Caspian Basin, particularly in the study area by several river systems. The study area has several characteristics typical of landlocked marine environments: Low salinity; low HD conditions, causing stratification of the water column. High primary productivity of the water mass, generating conditions of dissolved oxygen supersaturation and deficits (of phosphorus and probably of oxygen at night). Also at the sediment level, the heterogeneity of the substrate and low benthic fauna content is typical of confined habitats, in which environmental conditions are especially difficult for the higher organisms. The micro-pollutant concentration in both the water and sediment, a point also common to most confined habitats and related to the inflow from the catchment area. It is related to the fine fraction of the sediment and may be masked by the presence of numerous shell debris which “dilute” the muds and thereby the micro-pollutants and organic matter, usually settled on these fine sediment fractions. All the observations made on the study, substantial primary production, a paucity of benthos, etc are consistent with those made by different authors describing the Caspian Sea. The study area has high quantities of contaminants and low capabilities for dispersing potential intake, but on the other hand, has a distinct resistance to the influence of any future impediments