Laizhou Bay (Laizhou Wan) is the southern arm of the Bohai Sea (also Known as the Bohai Bay, or just Bo Hai), which is a large relatively shallow extension of the Korea Bay (Northern Yellow Sea) behind the Liaodong Peninsula to the north, and the Shandong Peninsula to the south. Both peninsula are roughly triangular in shaped and oriented pointed side to the Bohai Strait (Bohai Haixia), the mouth opening out to the Yellow Sea via the southern region of the Korea Bay. Bo Hai (Chinese: 渤海; pinyin: B hăi; Wade-Giles: Po-hai lit. ... The Korea Bay is located at the north of the Yellow Sea, between Liaoning Province of China and North Pyŏngan Province of North Korea. ... The Yellow Sea (in North and South Korea, it is also called the West Sea (strangely not disputed like East Sea) is the northern part of the East China Sea, which in turn is a part of the Pacific Ocean. ... The Liaodong Peninsula (sim. ... The Shandong Peninsula (sim. ...
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References
Tom McKnight,PhD, et al.; Geographica (ATLAS), 1999-2004, 3rd revision, Barnes and Noble Books AND Random House, New York, ISBN 0-7607-5974-X, 618 pp.
Bays form where weak (less resistant) rocks (such as sands and clays) are eroded, leaving bands of stronger (more resistant) rocks (such as chalk, limestone, granite) forming a headland, or peninsula.
Sometimes bays form where movements of the earth's crust (tectonics) bring areas of land together, or move them apart.
Bay of Gdansk between Poland and Kaliningrad Oblast