Jiaolai Plain (simplified Chinese: 胶莱平原; traditional Chinese: 膠萊平原; pinyin: Jiāolái píngyuán) is a plain located in the south central part of Shandong Province between the middle hills (中山丘陵) and low hills (低山丘陵) and the low hills of Jiaodong.
[3] Its northern and southern tips are surrounded by sea bays.
[6] The plain mainly includes most of Weifang and the northern part of Qingdao.
[7] Jialai Plain is one of the major arable land concentration areas in Shandong.
[8] According to modern geographical studies, the plain was flooded by seawater for a long time more than 4,000 years ago.