The city plans to set up a sea turtle protection centre to promote marine bio-diversity conservation in the region, state-run Xinhua news agency reported today.
Sansha mayor Xiao Jie said the city intents to build a sea turtle refuge that integrates such functions as hatching, release and research.
The centre is expected to attract experts, volunteers and environmental organisations to Sansha, he said.
SanshaCity was officially established in 2012 to administer a host of islands, including the Spratly Islands.
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The Philippines, Vietnam, Malaysia, Brunei and Taiwan contested Beijing's claims over the area.
An international tribunal formed following the Philippines petition has struck down China's claims on almost all of the South China Sea.
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Over the past four years, the Sansha city's environment has seen great improvements thanks to the new garbage collection system, sewage treatment plants and afforestation efforts, the Xinhua report said.