Nowadays, for managing coastal zones and littoral lands, we need accurate and updated information on hydrography of coastal areas. These data can be obtained by local measurements, airborne imagery and satellite data. Using satellite data is not time-consuming and expensive like than other methods, thus it is most economical method in the world. Unfortunately, this method is not developed in Iran, although it has many advantages. In this paper, the advantages of Landsat data have been taken to provide hydrographical maps after applying some specific image processing techniques. Landsat TM images were used.