Anzali Lagoon (also spelled Anzali Wetland) is a coastal lagoon and wetland complex located on the southern shore of the Caspian Sea near the city of Bandar-e Anzali in Gilan Province, northern Iran. The lagoon covers an area of approximately 60 km², though its size fluctuates seasonally with variations in river inflow and sea level.
Geography and Hydrology
The lagoon receives freshwater primarily from the Sefīd-Rūd River and several smaller streams, while also being subject to tidal influences from the Caspian Sea. The mixing of fresh and brackish water creates a gradient of salinity that supports diverse aquatic habitats, including open water, reed beds, mudflats, and submerged vegetation.
Ecological Significance
Anzali Lagoon is recognized for its high biodiversity. It provides habitat for numerous fish species, amphibians, reptiles, and a wide array of aquatic and terrestrial invertebrates. The area is an important stopover and wintering site for migratory waterbirds, including species such as the Dalmatian pelican (Pelecanus crispus), greater flamingo (Phoenicopterus roseus), and various ducks, geese, and shorebirds. The surrounding reed beds and marshes support dense plant communities dominated by common reed (Phragmites australis) and other emergent macrophytes.
Conservation Status
The lagoon has been designated as a Ramsar Site (Wetland of International Importance) under the Ramsar Convention, reflecting its significance for waterfowl and overall wetland ecology. It is also included within the “Anzali Wetland Protected Area” established by the Iranian Department of Environment. Management efforts focus on regulating pollution, controlling invasive species, and maintaining water quality.
Threats
Key environmental pressures on Anzali Lagoon include:
- Industrial and municipal pollution: Discharges from nearby factories, oil refineries, and urban runoff contribute contaminants such as heavy metals and nutrients.
- Aquaculture and fishery activities: Intensive fish farming and unregulated fishing can alter aquatic communities and degrade habitats.
- Land‑use change: Urban expansion and agricultural drainage affect the natural hydrological regime.
- Invasive species: Non‑native flora and fauna have been reported, potentially outcompeting native species.
Research and Monitoring
Scientific studies have documented the lagoon’s water quality parameters, species inventories, and ecological dynamics. Ongoing monitoring programs by Iranian research institutions and international partners aim to assess the effectiveness of conservation measures and to develop adaptive management strategies.
Cultural and Economic Importance
The lagoon supports local livelihoods through fisheries, ecotourism, and recreation. Traditional fishing practices and the presence of bird‑watching attractions contribute to the regional economy, while also fostering community interest in preserving the wetland’s health.
Reference Summary
- Ramsar Convention (Site No. 1303) – Anzali Lagoon, Iran.
- Iranian Department of Environment – Protected Areas Management Reports.
- Peer‑reviewed articles on Caspian Sea coastal wetlands (e.g., Journal of Wetland Ecology, 2020‑2023).
