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
Highway systems of South Korea Expressways National Local

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.