Line 16 of the Beijing Subway (Chinese: 北京地铁16号线; pinyin: běijīng dìtiě shíliù hàoxiàn) is a rapid transit rail line in Beijing. Currently, the line is 31.5 km (19.6 mi) in length with 16 stations. It will be 49.8 km (30.9 mi) with 30 stations when fully completed. The line is fully underground. Construction began in December 2013. The northern section, from Bei'anhe to Xiyuan was opened on 31 December 2016. An infill station, Nongda Nanlu was opened on December 30, 2017. It extended to Ganjia Kou on 31 December 2020, and extended to Yuyuantan Park East Gate on 31 December 2021.