永定河
Yongding is about 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 district: Yongding River () and Xiayang Creek (). 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 per year.