Bohai Bay () is one of the three major bays of the

Bohai Sea The Bohai Sea () is a marginal sea approximately in area on the east coast of Mainland China. It is the northwestern and innermost extension of the Yellow Sea, to which it connects to the east via the Bohai Strait. It has a mean depth of a ...

, the northwestern and innermost

gulf A gulf is a large inlet from the ocean into the landmass, typically with a narrower opening than a bay, but that is not observable in all geographic areas so named. The term gulf was traditionally used for large highly-indented navigable bodie ...

of the

Yellow Sea The Yellow Sea is a marginal sea of the Western Pacific Ocean located between mainland China and the Korean Peninsula, and can be considered the northwestern part of the East China Sea. It is one of four seas named after common colour terms ...

. It is bounded by the coastlines of eastern

Hebei province Hebei or , (; alternately Hopeh) is a northern province of China. Hebei is China's sixth most populous province, with over 75 million people. Shijiazhuang is the capital city. The province is 96% Han Chinese, 3% Manchu, 0.8% Hui, an ...

(

Tangshan Tangshan () is a coastal, industrial prefecture-level city in the northeast of Hebei province. It is located in the eastern part of Hebei Province and the northeastern part of the North China Plain. It is located in the central area of the Boha ...

and

Cangzhou Cangzhou () is a prefecture-level city in eastern Hebei province, People's Republic of China. At the 2020 census, Cangzhou's built-up (''or metro'') area made of Yunhe, Xinhua districts and Cang County largely being conurbated had a populatio ...

Tianjin municipality Tianjin (; ; Mandarin: ), alternately romanized as Tientsin (), is a municipality and a coastal metropolis in Northern China on the shore of the Bohai Sea. It is one of the nine national central cities in Mainland China, with a total popula ...

and northern Shandong province (

Binzhou Binzhou (, ), formerly Putai, is a prefecture-level city in northern Shandong Province in the People's Republic of China. The city proper sits on the northern bank of the Yellow River, while its administrative area straddles both sides of its ...

and

Dongying Dongying (), a prefecture-level city, lies on the northern (Bohai Sea) coast of Shandong province, People's Republic of China. As of the 2020 census, 2,193,518 people resided within its administrative area of and 1,188,656 in the built-up area ...

) south of the Daqing River

estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environment ...

(which is an old

mouth In animal anatomy, the mouth, also known as the oral cavity, or in Latin cavum oris, is the opening through which many animals take in food and issue vocal sounds. It is also the cavity lying at the upper end of the alimentary canal, bounded on ...

Luan River The Luan River (, formerly known as ''Lei Shui'', or ''Ru Shui'') is a river in China. River The river flows northwards from its source in the province of Hebei into the province of Inner Mongolia, and then flows southeast back into Hebei to its m ...

Laoting County Laoting County (), often mispronounced as Leting County in accordance with the alternative frequently used Mandarin pronunciation, is a county in the northeast of Hebei province, People's Republic of China, facing the Bohai Sea to the east and s ...

) and north of the

Yellow River The Yellow River or Huang He (Chinese: , Standard Beijing Mandarin, Mandarin: ''Huáng hé'' ) is the second-longest river in China, after the Yangtze River, and the List of rivers by length, sixth-longest river system in the world at th ...

estuary. It is the most southerly water in the

northern hemisphere The Northern Hemisphere is the half of Earth that is north of the Equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's Nort ...

where

sea ice Sea ice arises as seawater freezes. Because ice is less dense than water, it floats on the ocean's surface (as does fresh water ice, which has an even lower density). Sea ice covers about 7% of the Earth's surface and about 12% of the world's oce ...

can form. The Bohai Bay is the drainage destination of the

Hai River The Hai River (海河, lit. "Sea River"), also known as the Peiho, ("White River"), or Hai Ho, is a Chinese river connecting Beijing to Tianjin and the Bohai Sea. The Hai River at Tianjin is formed by the confluence of five watercourses: the ...

and 15 other rivers. Due to these rivers' muddy runoff, the bay used to be a highly silty water body, but extensive damming of the various river systems has greatly diminished siltage. Nevertheless, the Bohai Bay in effect concentrates the runoff of the whole eastern

North China Plain The North China Plain or Huang-Huai-Hai Plain () is a large-scale downfaulted rift basin formed in the late Paleogene and Neogene and then modified by the deposits of the Yellow River. It is the largest alluvial plain of China. The plain is bord ...

, and the Bay is an intensely polluted body of water. Reduced silt deposition and

sea level rise Globally, sea levels are rising due to human-caused climate change. Between 1901 and 2018, the globally averaged sea level rose by , or 1–2 mm per year on average.IPCC, 2019Summary for Policymakers InIPCC Special Report on the Ocean and Cry ...

are causing problems with sea encroachment in some coastal areas. Fisheries were traditionally some of the richest in China, fed by enormous sediment runoff and extensive shallows to serve as

hatcheries A hatchery is a facility where eggs are hatched under artificial conditions, especially those of fish, poultry or even turtles. It may be used for ex-situ conservation purposes, i.e. to breed rare or endangered species under controlled condi ...

. Pollution,

eutrophication Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phytopla ...

habitat destruction Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...

caused by land reclamation, and intense

overfishing Overfishing is the removal of a species of fish (i.e. fishing) from a body of water at a rate greater than that the species can replenish its population naturally (i.e. the overexploitation of the fishery's existing fish stock), resulting in th ...

have resulted in a collapse of stocks, and a decline of trawl catch per unit of effort (CPUE) from 138.8 kg/net.hr to 11.2 kg/net.hr from 1959 to 1998. The Bohai Bay is ringed by several major ports: the

Port of Tianjin The Port of Tianjin (''Tianjin Gang'', ), formerly known as the Port of Tanggu, is the largest port in Northern China and the main maritime gateway to Beijing. The name "Tianjin Xingang" (), which strictly speaking refers only to the main seaport ...

, the large

Port of Tangshan The Port of Tangshan () is an artificial deep-water international seaport on the coast of Tangshan Municipality, Hebei, in Northern China. It is the 9th largest port in China and is composed of three separate port areas: Jingtang, Caofeidian an ...

itself which consists of three ports (

Caofeidian Caofeidian () is a land reclamation-converted economic development zone in Bohai Bay located in the eponymous district of Tangshan, Hebei Province, China.

, Jingtang and Fennan), and the

Port of Huanghua The Port of Huanghua, also known as the Port of Cangzhou Huanghua is an artificial deep-water international seaport on the coast of Huanghua, Cangzhou Prefecture, Hebei, People's Republic of China. It is located on the south side of the Bohai Bay ...

, making the Bay into a very crowded waterway. Land reclamation in Tianjin and in Caofeidian have greatly changed the littoral zone, and destroyed much of the area's

wetlands A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The ...

. Land reclamation has also affected migratory birds. As is the case of most of the Bohai Sea, the Bohai Bay is rich in hydrocarbon deposits and has several active offshore

oil field A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in porous or fractured rock formations. Such reservoirs form when kerogen (ancient plant matter) is created in surrounding rock by the presence ...

s. Jidong Nanpu contains , while the bay as a whole is estimated to contain . On June 4, 2011, a large oil spill occurred related to the

China National Offshore Oil Corporation China National Offshore Oil Corporation, or CNOOC Group (Chinese: 中国海洋石油总公司 Pinyin: ''Zhōngguó Háiyáng Shíyóu Zǒnggōngsī''), is one of the largest national oil companies in China, and the third-largest national oil c ...

References

See also