Homayoun Khoshravan - Head of Environment research management Group (EMRIRAN), Science research and Technology ministry of Iran , Mazandaran, Iran,

The Caspian rapid Sea level changing has direct impact on the marginal basin. Morphologic and environment condition of many bays of the Caspian Sea have beenaffected during the last century. Ghara- Boghaz Gol as the biggest Bay of the Caspian Sea had experienced full drought condition in 1984 while the Caspian Sea leveldecreased about 3 meters during 1930- 1978[1]. Gorgan Bay is the other main marginal basin in the south-easternof the Caspian Sea which has same vulnerability responseto the sea level changing. Nowadays the Gorgan bay has lost vast parts of its water supplies due to Caspian Sea level decrease and its morphological consideration haschanged obviously [2]. Therefore, the main objective of this paper is the evaluation of morphological changing of Gorgan bay due to sea level fluctuation of the Caspian Sea.