Coastal wetlands, as transitional ecosystems, provide a wide range of ecosystem services, particularly in supporting livelihood opportunities. However, these ecosystems are being increasingly degraded worldwide as a result of expanding human activities.The conversion and loss of coastal wetlands into agricultural, urban and industrial land uses have had significant impacts on the population and diversity of waterbirds, while these species rely on wetlands for part of their life cycle. As a result, wetlands and their associated wildlife are considered among the most endangered ecosystems in the world. Bandar Kiashahr Lagoon is part of the Boujagh International Wetland which is classified as a coastal-marine wetland. This lagoon, due to meeting criteria 1, 2, 4, and 6 of the Ramsar Convention, was registered in the Ramsar Wetlands List in 1975 with an area of 500 hectares. This area is also recognized as an Important Bird Area (IBA) and one of the Ecologically or Biologically Significant Marine Areas (EBSA). The aim of this study was to investigate the environmental characteristics of Bandar Kiashahr Lagoon. The findings of this study can help stakeholders in identifying opportunities for the enhanced conservation of this coastal ecosystem.