The Bohai Sea or Bo Sea, also known as Bohai Gulf, Bo Gulf or Pohai Bay (Chinese: 渤海; lit.: 'Bo Sea'), is a marginal sea approximately 78,000 km2 (30,000 sq mi) 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.
A medium-sized gulf, the Bohai Sea is enclosed by four provinces from three different regions of China — Liaoning (of Northeast China), Hebei and the Tianjin municipality (of North China), and Shandong (of East China). It is considered part of both the internal waters of the People's Republic of China and the center of the Bohai Economic Rim. Its proximity to the Chinese capital of Beijing makes it one of the busiest seaways in the world.
A medium-sized gulf, the Bohai Sea is enclosed by four provinces from three different regions of China — Liaoning (of Northeast China), Hebei and the Tianjin municipality (of North China), and Shandong (of East China). It is considered part of both the internal waters of the People's Republic of China and the center of the Bohai Economic Rim. Its proximity to the Chinese capital of Beijing makes it one of the busiest seaways in the world.