#wikipedia.org. Yongding River. The Yongding River (Chinese: 永定河; pinyin: Yǒngdìng Hé; Wade–Giles: Yungting Ho) is a river in northern China. It is one of the main tributaries in the Hai River system and is the largest river to flow through Beijing. In recent years, the Beijing segment of the river has dried up due to environmental issues. The Beijing municipal government has inve
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