Li Ruiyong, the former president of the Jinan Photographers Association, has photographed the changes undergone by Jinan's springs over the past 70 years.

Here he presents some of his works in celebration of the 70th anniversary of the founding of the People's Republic of China.

Photo taken by Li Ruiyong shows volunteers from the Jinan Communist Youth League help clear mud at Baotu Spring in 1981. [Photo by Li Ruiyong/ijinan.e23.cn]

Photo taken in 1988, during the dry season at Baotu Spring. Baotu Spring, the most well-known of the 72 springs in Jinan, began to experience seasonal hiccups in the early 1970s and once dried up for a period of 926 days. [Photo by Li Ruiyong/ijinan.e23.cn]

A lively scene at Daming Lake during the May Day holiday in the 1970s. [Photo by Li Ruiyong/ijinan.e23.cn]

Students draw Daming Lake in the late 1970s. [Photo by Li Ruiyong/ijinan.e23.cn]

Aerial view of modern day Daming Lake. [Photo by Li Ruiyong/ijinan.e23.cn]

Baotu Spring at night. [Photo by Li Ruiyong/ijinan.e23.cn]

Li Ruiyong, former president of the Jinan Photographers Association, shows off his album featuring Jinan's scenic spots over past 70 years. [Photo by Li Ruiyong/ijinan.e23.cn]