Hendijan tide times

Hendijan is a port and fishing community on the northern Persian Gulf coast of Iran, in Khuzestan Province, west of Bushehr and east of the head of the Gulf where the Shatt al-Arab empties into the sea. The town sits on the edge of a mangrove-lined tidal estuary, one of the few remaining significant mangrove habitats on Iran's Persian Gulf coast. The Hendijan mangrove complex, known locally as the Hendijan Estuary Wetland, is a protected area under the Iranian Department of Environment.

The Persian Gulf at Hendijan has mixed semidiurnal tides with significant diurnal inequality and a spring range of approximately 1.5 to 2.5 metres. Tide predictions here use Open-Meteo Marine's global model, with ±45 minutes timing accuracy and ±0.2 to 0.3 metres height accuracy. The shallow northern Gulf, particularly in the approach to the head of the Gulf near the Shatt al-Arab, amplifies tidal range and wind effects. Shamal events can add 0.5 to 1.0 metres of wind-driven surge on top of the predicted tide.

The mangrove species at Hendijan are the two Gulf mangrove species: Avicennia marina (grey mangrove) and Rhizophora mucronata (loop-root mangrove). These species represent the northern limit of mangrove distribution in the Persian Gulf — the winter water temperatures at this latitude (14 to 17°C at minimum in January and February) approach the cold tolerance threshold for mangrove survival. The Hendijan system has survived and regenerated, making it an important reference point for Gulf mangrove ecology and climate resilience research.

For the fishing community, the tidal channels through the mangrove provide access to the productive shrimp, crab, and fish habitat in the estuary. Traditional kalek (boat) fishing targets shrimp on the ebb tide as the water draws out through the channels, concentrating the crustaceans in predictable locations. The Hendijan shrimp fishery feeds a processing operation that exports to domestic and regional markets.

For birdwatchers, the mangrove and adjacent tidal flat support a productive winter assemblage. The western Iran Gulf coast is on the Central Asian-East African flyway; the Hendijan wetland accumulates waders and waterfowl from October through March. Greater flamingo flocks, grey herons, various cormorant species, and during migration season Palaearctic waders from as far as Siberia pass through.

Access to Hendijan from Ahvaz (the Khuzestan provincial capital) is by the Ahvaz-Bandar Imam highway and then south on the coastal road — a journey of approximately 3 to 4 hours. The town has basic facilities; the mangrove wetland area requires coordination with the local Department of Environment office for access to the protected zones.

The Hendijan estuary has been the subject of research by Iranian marine biologists and international conservation organisations focused on Gulf mangrove ecology. The two Gulf mangrove species present — Avicennia marina and Rhizophora mucronata — show different cold-tolerance thresholds; Avicennia (grey mangrove) is the more cold-tolerant and penetrates furthest north along the Gulf coast, while Rhizophora (red mangrove) is restricted to the warmer south Gulf waters and reaches its northern limit at or near Hendijan. The precise location of this distributional boundary has shifted over time as Gulf winter minimum temperatures have changed.

The shrimp fishery at Hendijan is part of the larger northern Gulf shrimp fishery that extends across the head of the Gulf from Kuwait to the Iranian coast east of Bushehr. The western Iranian Gulf shrimp grounds are managed by the Iranian Fisheries Organisation; catch limits and seasonal closures are set annually based on stock assessment data. The traditional kalek fishing boats operate within the tidal estuary system and in the nearshore Gulf; offshore shrimp trawling requires licensed commercial vessels. The two sectors of the fishery — artisanal and commercial — coexist with periodic tensions over access to the same grounds.

The broader wetland complex around Hendijan extends into the tidal creeks and salt marshes between the estuary and the Bandar Imam Khomeini industrial port to the west. This corridor of coastal wetland, though modified by adjacent industrial infrastructure, retains ecological function as a bird movement corridor along the Gulf coast. Migrating raptors, including the greater spotted eagle and the imperial eagle, have been recorded along the coast in October and November.