It is also known as Pingdi Yaohua (平地瑶话 "Lowland Yao dialect"), locally Piongtuojo, Piongtoajeu; "Yao" here might be a cultural designation, as only half of the one million speakers are classified as ethnic Yao.
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In Hunan it is found in the southeast, throughout most of Yongzhou prefecture (apart from Qiyang County in the northeast) and the western half of Chenzhou prefecture.
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Shaozhou Tuhua (traditional: 韶州土話; simplified: 韶州土话 Sháozhōu Tǔhuà "Shaoguan tuhua"), or simply Tuhua, is an unclassified Chinese language spoken in the border region of the provinces Guangdong, Hunan and Guangxi.
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Li & Zhuang (2009) cover the following dialects of Shaoguan Tuhua.
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There is likely also significant non-Chinese influence such as Yao, and it may even have started out as Sinicized Yao.