Located in Caidian Street and Daji Street, caidian district, Wuhan City, Hubei Province, it is a water system composed of Houguan Lake, Sanjiao Lake, Nanhu Lake and Anbaili Lake, with a water body area of 30 square kilometers, formerly known as Nanhu, also known as Hu Xiaonan (because Wuchang District of Wuhan City also has a Nanhu Lake). In 2005, it was renamed Yin Zhihu.

Hometown of bosom friend: refers to bosom friend lake area in caidian district, Wuhan City, Hubei Province. According to legend, the story of "Boyazi getting to know each other" happened here in the Spring and Autumn Period. Because Zhong Ziqi was a native of Gujixian Village (now the Zhiyin Lake District in Caidian) and was buried here, it was also called "the hometown of bosom friends".