永定河
The Fangshan Line starts at , just west of the East Yancun Bridge, where it interchanges with the Yanfang Line. Previously, it started at which is located at the intersection of Changhong Xi Lu and Suzhuang Dajie in the Liangxiang area of Fangshan District. The line makes four stops in Liangxiang including at the Fangshan Campus of the Beijing Institute of Technology. The line then heads north to the towns of Guangyang and Changyang. After crossing the Yongding River, the Fangshan Line enters Fengtai District where the line makes two more stops, at Dabaotai near the Beijing World Park, and at Guogongzhuang, also the southern terminus of Line 9. The line furthermore makes four stops northeast.