The story
Partial calque of Mandarin 渤海灣 /渤海湾 (Bóhǎiwān), from 渤海 (Bó Hǎi, “Bohai Sea”) + 灣 /湾 (wān, “bay”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Synonym of Bohai Sea, a gulf of the Yellow Sea in northeastern China Full definition →