nánpēng islands marine sanctuary in nan'ao county is also home to local pods. the population in leizhou bay, leizhou peninsula, comprising nearly 1,000 animals and the second largest population in the nation, may also be targeted for future tourism. hepu national sanctuary of dugongs, and waters around sanya bay and other coasts adjacent on hainan island are home to some dolphins. as the environment and local ecosystems recovery, dolphins' presences in nearby waters have been increasing such as vicinity to the nature sanctuary of weizhou and xieyang islands. gulf of tonkin waters in vietnam may have unstudied populations that may appear elsewhere such as along xuân thủy national park and hòn dáu island in hải phòng.