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| Haiphong Bay | |
|---|---|
| Name | Haiphong Bay |
| Native name | Vịnh Hạ Long? |
| Location | Gulf of Tonkin |
| Type | bay |
| Basin countries | Vietnam |
| Islands | Cat Ba, Bach Long Vi |
Haiphong Bay is a coastal bay in northern Vietnam opening to the Gulf of Tonkin, adjacent to the city of Haiphong, the province of Hai Duong, and the province of Quang Ninh. The bay forms part of a wider marine region that includes Halong Bay and the Red River Delta, and it lies within historical trade routes linking Tonkin with ports such as Hanoi, Hai Phong Port, Cat Ba Port, and Bach Long Vi Port. Its waters have been shaped by tectonic processes associated with the East Vietnam Sea and the South China Sea basin.
Haiphong Bay is situated off the northern Vietnamese coast near the urban center of Haiphong and the industrial zones of Dinh Vu, Le Chan District, and Hai An District. The bay connects to the Gulf of Tonkin and is bounded by islands including Cat Ba Island, Bach Long Vi Island, and smaller features used by local communities and by the Vietnam People's Navy for navigation. Major nearby transport nodes include Hai Phong Port, Quy Nhon Port, Hai Phong–Hanoi railway, and the Tien Hai–Ha Long road corridors, while maritime lanes historically linked it to Hong Kong, Guangzhou, Beijing, and Nagasaki.
The geology of the bay reflects the influence of the Red River Delta sedimentary processes, the regional faulting related to the Red River Fault System, and broader tectonics of the Eurasian Plate and the Philippine Sea Plate. Karst features in nearby Quang Ninh and Cat Ba National Park mirror carbonate platform development seen in Halong Bay and are associated with Ordovician to Cenozoic stratigraphy. Sea-level changes during the Pleistocene and the Holocene transgression sculpted shorelines, while local uplift and subsidence created estuarine channels resembling those documented in studies of the Mekong Delta and the Yangtze River Delta.
The bay experiences a tropical monsoon climate influenced by the East Asian monsoon, with seasonal winds comparable to those affecting Hanoi and Ha Long City. Winter northeasterlies and summer southwesterlies modulate precipitation patterns similar to Hai Phong and Thai Binh, and typhoon tracks from the Western Pacific periodically affect the region, as do extratropical systems impacting North Vietnam. Freshwater input derives from distributaries of the Red River and tributaries draining Hai Duong and Thai Binh, while salinity and turbidity gradients resemble those measured in the Gulf of Tonkin estuarine systems.
Marine and coastal habitats in and around the bay host assemblages akin to those in Halong Bay and Cat Ba National Park, including mangrove stands similar to Cần Giờ Mangrove Forest, seagrass beds comparable to those in Nha Trang Bay, and coral communities related to those off Ly Son Island and Phu Quoc. Fauna observed in the broader region include species recorded in Vietnamese marine surveys such as Epinephelus, Scomberomorus, and migratory populations linked to East Asian–Australasian Flyway. Birdlife connects to wetlands like Duyen Hai and Xuan Thuy National Park, while reef and benthic communities show similarities to those in Con Dao National Park and Bai Tu Long Bay.
Human use of the bay traces to historical maritime activity in Tonkin and contacts with Song dynasty traders, Ming dynasty missions, French Indochina colonial expansion, and wartime events such as naval operations during the First Indochina War and the Vietnam War. Coastal settlements developed alongside rice-producing districts of the Red River Delta and ports that linked to Maritime Silk Road networks, with cultural influences from Kinh people, Hoa people, and maritime communities documented in accounts from European explorers and Chinese historians. Religious and cultural sites in the region include pagodas and shrines reflecting traditions comparable to those on Cat Ba Island and in Quang Ninh Province.
The bay supports fisheries, aquaculture, shipping, and tourism patterns connected to Hai Phong Port, Cat Bi International Airport, and industrial areas such as Dinh Vu–Cai Lan Economic Zone and Deep-water port projects. Fisheries target species similar to those landed at Saigon Port and Cam Ranh Bay, while aquaculture parallels practices in Ha Long and Bac Lieu. Shipping lanes accommodate vessels servicing routes to Singapore, Shanghai, Busan, and Nha Trang, and regional economic plans reference infrastructure models like Lach Huyen Port and transshipment facilities observed at Hong Kong International Terminals.
Environmental pressures mirror those confronting coastal Vietnam: pollution from industrial zones similar to incidents at Formosa Ha Tinh Steel, habitat loss comparable to trends in Cần Giờ, sedimentation like that affecting the Red River Delta, and impacts from offshore construction reminiscent of activities near Vung Tau. Conservation responses draw on frameworks used in Cat Ba National Park, Bai Tu Long National Park, Xuan Thuy National Park, and international agreements including conventions aligned with Ramsar Convention principles. Stakeholders involve provincial authorities of Haiphong, provincial administrations of Quang Ninh and Hai Duong, research institutions such as Vietnam Academy of Science and Technology and universities in Hanoi, and NGOs that collaborate on marine protection similar to work by WWF and IUCN in Indochina.