Yongding (Chinese: 永定) is a district under the jurisdiction of Longyan prefecture-level city in the southwest of Fujian Province, People's Republic of China. It is the home of many Hakka-speaking families. Yongding has a population of about 400,000,[when] of which more than 99% are Hakka, the rest being Southern Min-speaking people. It was reported at the end of 2014 that Yongding had become a district, having previously been a county.
Yongding county is situated on the Fujian-Guangdong border. Shanghang County to the northwest and Longyan centre to the northeast are in Longyan; Nanjing County to the east and Pinghe County to the southeast are in Zhangzhou. To the southwest lies Dabu County of Meizhou, GD. Both Dabu and Shanghang are Hakka-speaking counties; Longyan Centre, Nanjing and Pinghe are predominantly Minnan-speaking.
Yongding is about 2,500 km2 (970 sq mi) in area. Like other counties of Fujian province, Yongding is 80% hills and mountains, 10% water or rivers, and 10% fields. Two major rivers run through the county: Yongding River (永定河) and Xiayang Creek (下洋溪). Both are tributaries of the Ting River (汀江, the name by which it is known in Fujian territory) or Han River (韩江, the name by which it is known in Guangdong province). Located in a sub-tropical area and subject to typhoons, Yongding has high annual precipitation of about 1,200 to 1,500 millimetres (47 to 59 in) per year.