via Bangkok Post, 29 November 2018: Along with Cambodia, Thailand’s Khon dance is also listed in Unesco’s Intangible Cultural Heritage list.

Unesco has listed Thai khon as intangible cultural heritage of humanity.
Culture Minister Vira Rojpojchanarat said the 13th session of the Intergovernmental Committee for the Safeguarding of the Intangible Cultural Heritage agreed to officially list Thailand’s khon masked dance drama as intangible cultural heritage on Thursday.
Mr Vira credited the success to Her Majesty Queen Sirikit’s contribution to preserve and improve the art.
Source: Unesco lists ‘khon’ as cultural heritage | Bangkok Post: lifestyle
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