Laizhou Bay (simplified Chinese: 莱州湾; traditional Chinese: 萊州灣; pinyin: Láizhōu Wān) is the southern arm of the Bohai Sea (also known as the Bohai Gulf, or just Bo Hai), which is a large relatively shallow extension of Korea Bay (Northern Yellow Sea) behind the Liaodong Peninsula to the north, and the Shandong Peninsula to the south.