虹口区
During the Tang dynasty, the area in modern Hongkou District have been a beach included in a seawall (捍海塘) near the East China Sea. In the early Ming dynasty, it was started known as 黃埔口 (Huangpukou) or 洪口 (Hongkou), as there is a river mouth debouched into the Huangpu River, in the early Qing dynasty, it was renamed as 虹口 (Hongkou).