Bohai Bay (or 渤海湾
) is one of the three bays forming the Bohai Gulf
, the innermost gulf of the Yellow Sea, in northeast China. It borders Hebei province and Tianjin Municipality. The three bays are Laizhou Bay to the south, Liaodong Bay to the north, and Bohai Bay to the west. It is the most southerly sea in the northern hemisphere in which sea ice can form.