Region of studied area located in east of Gilan province in form little with coastal band in east segment and wider than in western of region between Astaneh and Chaboksar .
Numerous wells are drilled for using of ground water which is occurring damages in aquifers and we cant reduce its effect. For example , decreasing of precipitation and increasing of the evaporation.
This research is represented which saline water invasion occurred in coastal aquifer.
Geoelectrical studies carried out by schlumberger array (AB=1000 m) in 9 profile and 80 sounding according to sounding location map. By this data is produced a geoelectrical resistivity map that is represented final poison of saline front. Profiles studies defined saline water area, fossil water, artesian areas and suitable ground water areas.
Subject of important is concluded from studies that Sefidroud river can be a major guard obstacle in opposite to invasion of saline water and Polroud river and Shalmanroud river can play this role in region too.

Therefore distinguished saline water area in map is occurred by excessive extraction of deep wells which will occurred critical conditions in aquifers, then the best safe position is located in margins of Sefidroud and Polroud and Shalmanroud rivers and they have residue in hidden channel river and in this locations can be proposed to drilled deep wells by controlled conditions