The Caspian Sea coastal wetlands currently encountering drastic shrinking and desiccation due to rapidsea level fall and mismanagement of water resources. The Caspian coastal wetlands that located on theCaspian Sea shores benefits from the Caspian Sea waters. They are mainly coastal lagoons and bays extentof which strongly depended on the CS level (Kroonenberg et al., ۲۰۰۰; Lahijani et al., ۲۰۰۹; Kakroodi et al.,۲۰۱۲; Naderi et al., ۲۰۱۳) that fell around ۱.۶ m during the past decade. The Caspian coastal lagoons haveexperienced restriction during sea level fall of ۱۹۶۰s and ۱۹۷۰s, however the current anthropogenicpressure and climate change superimposed on the impact of sea level fall and exacerbated the ecosystemdecline. Using comprehensive measurements and investigation, here the main focus is on the way ofremediation or restoration of the Gorgan Bay. Field campaigns have been conducted in the Gorgan Bay formeasurements and sampling in ۲۰۱۸, ۲۰۱۹ and ۲۰۲۰ (Fig. ۱). In situ measurement of water columnproperties including temperature, conductivity, pressure, dissolved oxygen, and pH were done using anOcean Seven ۳۱۶ CTD probe. Five current meter RCM۹ have been installed in the main inlet of the GorganBay for ۱۵ days and short term measurement conducted in two bifurcated inlets. FVCOM hydrodynamicmodel has been used in the Gorgan Bay, which is a general volume water circulation model with a finitevolume method. Here, FVCOM hydrodynamic model and WRF-Chem model have been used to simulatethe Gorgan Bay water circulation and dust emission respectively. Current measurements demonstratedthat mean velocity is around ۳ cm/s and dominant current is toward the Gorgan Bay. Current frequencyanalysis displays they fall into three groups of wind driven, tidal and density currents. The CTD data showsthat salinity of the Gorgan Bay waters is greater than that of the Caspian waters and reached up to ۲۰ PSUin the eastern part of the bay in summer ۲۰۲۰. The Gorgan Bay water is well mixed and did not showsignificant stratification. In case more water level decline and desiccation of the Gorgan Bay the bottomsediments are exposed for wind transport which based on the WRF-Chem model they can play role of localdust source and travel up to ۵۰ km in Mazandaran and Golestan provinces. The FVCOM currentsimulations revealed that general circulation in the Gorgan Bay is cyclonic during warm period of the yearand anticynclonic during cold period with dominant wind forcing, where in the westernmost due tonarrowing the basin an anticynclonic eddy is developing. Average velocity of simulated currents in theGorgan Bay inlet is ۷ cm/s and ۲ cm/s during high sea level and low sea level respectively. Shallowing theGorgan Bay inlet due to sea level fall, high sedimentation rate and growing seaweeds drastically reducedwater exchange between the Caspian Sea and Gorgan Bay. The current Caspian Sea level is much higherthan that in the extreme lowstand of ۱۹۷۹, however the Gorgan Bay environment receives much morepressure compared to that period. Intensive human activities and global warming are two new componentsthat exacerbated the Gorgan Bay environment. Current simulation in a scenario of deepening and wideningof the two main inlets showed that velocities significantly increases and the bay water residence timereduces. Water exchange facilitation along with reducing human pressure could restore the Gorgan Bayenvironment during sea level fall in amplitude that happened in the past two centuries.