This work reveals the usefulness of the GIS ( Geographical Information Systems) mapping techniques to show the distribution of pollutants along a coastal environment of Black Sea of Turkey. The Black Sea, a nearly enclosed and isolated environment, has suffered from severe ecological changes during the last three decades. A toal of 39 sampling statons at 3 different distances from the coast ( 500 m, 3 miles and 20 miles) during four season between 2013 and 2014 for water quality monitoring were selected along the mid- Black Sea coast of Turkey. Characterization of changes in water quality is an important aspect for evaluating the potential impact of natural or anthropogenic, point and non-point sources of pollution on ecosystem health. The result showed that contamination of coastal waters occurred mainly from domestic and industrial wastewater discharges and agricultural runoff. Annual and/or seasonal average concentration of certain water quality parameters ( MBAS, NH4+-N, Phenol, NO3- - N, TOC, TC and certain heavy metals) through mid Black Sea off-shore are figured by GIS technique in order to show the off-shore variation of pollutant concentrations. Annual average concentration of heavy metals shown us that there is considerably higher concentration of metal pollution through the study area both at spatial and non-spatial variations.

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