Seoul City Route 21
| Seoul Special Metropolitan City Route 21 | |
|---|---|
| 서울특별시도 제21호선 | |
| Route information | |
| Part of AH1 | |
| Length | 24.2 km (15.0 mi) |
| Major junctions | |
| From | Geumcheon District, Seoul |
| To | Eunpyeong District, Seoul |
| Location | |
| Country | South Korea |
| Highway system | |
Seoul Metropolitan City Route 21 (Korean: 서울특별시도 제21호선) is an urban road located in Seoul, South Korea. With a total length of 24.2 km (15.0 mi), 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.