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In page Boat Dwellers:

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Regarding the Fujian Minyue Boat Dwellers it is suggested that in the southeast coastal regions of China, there were many sea nomads during the Neolithic era and they may have spoken ancestral Austronesian languages, and were skilled seafarers.[3] In fact, there is evidence that an Austronesian language was still spoken in Fujian as late as 620 AD.[4] Some therefore believe that the Boat Dwellers were Austronesians who could be more closely related to other Austronesian groups such as Filipinos, Javanese, or Balinese.[citation needed]