The source protection stone was erected in 2017 to commemorate the 20th anniversary of Hong Kong's return to China. On the stone tablet, "we must protect the source water of the Dongjiang River" is an inscription written by Premier Zhou Enlai. In 1963, Hong Kong suffered the worst drought in more than 60 years, and the lives of 3.5 million people were in trouble due to water shortage. In December of that year, Premier Zhou Enlai personally gave instructions and allocated special funds to complete the Dongshen water supply project in Shenzhen in 11 months, leading the water from Dongjiang River to Hong Kong, thus ending the long history of water shortage in Hong Kong. The shape of the source protection stone is like a palm, which means to protect the source by hand. The stone is 5.23 meters high, corresponding to the length of 523 kilometers in the Dongjiang River Basin and 3 meters wide, representing Jiangxi, Guangdong and Hong Kong; The base of the source protection stone is 4.65m long, which corresponds to the 465km distance from Sansan mountain to Hong Kong; The flower bed is round, which means "round and full".