Seoul City Route 21
Seoul Metropolitan City Route 21 is an urban road located in Seoul, South Korea. With a total length of, this road starts from the Siheung Intersection in Geumcheon District, Seoul to Yeonsinnae Station in Eunpyeong District. This route is a part of Asian Highway 1.
Stopovers
; Seoul- Geumcheon District - Gwanak District / Guro District - Dongjak District / Yeongdeungpo District - Dongjak District - Yongsan District - Jung District - Jongno District - Seodaemun District - Eunpyeong District