What is "yongding"

Yongding may refer to the following in China:

• Yongding River, in Beijing, China
• Yongding District, Longyan, a district in Longyan, Fujian, China
• Yongding District, Zhangjiajie, a district in Zhangjiajie, Hunan, China
• Yongding Subdistrict, a subdistrict in Yongding District, Zhangjiajie