Chrzšszczewska Island is located west of Kamień Pomorski in the area of the Dziwna River mouth. In the lower southern part of it one can find the bed of gyttia-peat covered with muds. From the latter the gyttia-peat-muck soils have created and are being used as meadows and pastures. Within those meadows there are sets of halophyte areas as the characteristics of that soil is under influence of the salty Baltic waters reaching the Kamieński Bay during the storms. Apart from that the salinity of these waters is caused by outflow of highly mineralized (about 20%.) chloro-sodium waters connected with the geological strata of that area. In the paper the chemical characteristics of this soil has been presented including the contain of soluble sodium in HCl of concentration 0.5 mol dm-3 and the contain of soluble sodium in concentrated acids HNO3 + HClO4 as well as the salinity. The concentration of sodium has increased with the depth of the stratum reaching 2.5-3.8% at the depth of 3-4 meters.