There were no coastal sand bar formation process for generating the Qilihai lagoon, and its predecessor is a deflation low-lying land formed during the last stage of late Pleistocene, so the Qilihai lagoon is not a lagoon scientifically.

• 七里海也不是科学意义上的潟湖，它没有形成海岸沙坝这一潟湖形成的过程，其前身是晚更新世末期由风暴活动形成的风蚀洼地。