The Black Pond Turtles, which are listed as a "vulnerable" species, were smuggled from Pakistan to Taxkorgan in China's Xinjiang autonomous region in June.
According to a Chinese government statement, the turtles were found on a truck. Authorities arrested a suspect and then five would-be buyers.
Wildlife officials in August had travelled by road to bring the turtles back home to a sanctuary in Sukkur, where they were held in quarantine.
"It is like we rescued a ship from the clutches of pirates. We are now releasing them into their natural habitat and it is a great accomplishment for me and my whole team," Javed Mahar, the chief of Sindh Wildlife Department, told AFP.
The black turtles, which feed on plants, fish and shrimp, are also found in India's Ganges as well as the rivers of Bangladesh and Nepal.
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