The five lakes refer to Dongting Lake, Poyang Lake, Taihu Lake, Chaohu Lake and Hongze Lake, the four seas refer to the Yellow Sea, the East China Sea, the South China Sea and the Bohai Sea, and the five lakes and four seas refer to all parts of the country and sometimes all parts of the world; The present tense also means extensive union.
Dongting Lake, formerly known as Yunmeng, Jiujiang and Chonghu, is located on the south bank of Jingjiang River in the middle reaches of the Yangtze River, spanning Yueyang, Guluo, Xiangyin, Wangcheng, Yiyang, Yuanjiang, Hanshou, Changde, Jinshi, Anxiang and Nanxian. The name of Dongting Lake began in the Spring and Autumn Period, and it was named after Dongting Mountain in the lake during the Warring States Period. Dongting Lake receives water from Songzi, Taiping, ouchi and Diaoxian counties of the Yangtze River, connects with four small tributaries of Hunan, Zi, Yuan and Li in the south and west, and flows into the Yangtze River from Chenglingji, Yueyang City.
Introduction to the Yellow Sea:
The Yellow Sea is the largest marginal sea in the western Pacific Ocean, which lies between Chinese mainland and the Korean Peninsula. It is a typical roughly north-south sea area. The northwest is bounded by the connecting line between Laotieshan Angle at the southern end of Liaodong Peninsula and Penglai Angle on the northern shore of Shandong Peninsula, and is connected with Bohai Sea. In the south, it is bounded by the connecting line between Qidongzui on the north bank of the Yangtze River estuary in China and the southwest corner of Jeju Island, and is connected with the East China Sea.
The average water depth of the Yellow Sea is 9 1 m, and the seabed is flat, with most water depths above 60 meters. The name of the Yellow Sea comes from the yellow color of its vast waters. The Yellow Sea once belonged to a part of the East China Sea. In the early Qing Dynasty, the Yellow Sea was called the "Eastern Ocean", and now the East China Sea is called the "Southern Ocean". At the end of Qing Dynasty, maps published after 1908 all used this name.