勃海
Han dynasty province around the Bohai sea; renamed 渤海 after the Han
渤海
Bohai Sea, or Bo Hai, between Liaoning and Shandong; Parhae, Korean kingdom in Manchuria and Siberia 698-926
薄海
vast area; all the way to the sea
环渤海湾地区
Bohai Economic Rim (economic region including Beijing, Tianjin, Hebei, Liaoning and Shandong)