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Jyutping mung4 dung1
Pinyin méng dōng

Definitions (Wiktionary)
  1. name
    the eastern part of Inner Mongolia, comprising Chifeng, Tongliao, Hulunbuir, Hinggan League, and sometimes also Xilingol League

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Jyutping mung4 dung1
Pinyin měng dōng

Definitions (Wiktionary)
  1. name
    the eastern part of Inner Mongolia, comprising Chifeng, Tongliao, Hulunbuir, Hinggan League, and sometimes also Xilingol League