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In page Sumba:

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The Sumbanese have a mixture of Austronesian and Melanesian ancestry.[citation needed] Sumba is home to 24 ethnic groups who speak nine Austronesian languages, some of these including several dialects.[8] The largest language group is the Kambera language, spoken by a quarter of a million people in the eastern half of Sumba. Other local languages include Wewewa and Anakalang in the west, while in the far southeast are speakers of the Sabu language, shared with the islands of Savu and Raijua to the east.