Gavkhouni Wetland located in the Iranian Plateau in central Iran, east of city of Isfahan, is the terminal basin of the Zayandeh River. Gavkhouni is a salt marsh with a salinity of 31.5% and an average depth of about 1 m. The salt marsh can dry up in summer. The Zayandeh River originates in the Zagros Mountains and travels around 300 km, before terminating in Gavkhouni. Gavkhouni receives pollution from Isfahan and other urban sources.