Seoul City Route 21 (Trunk)

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Seoul Special Metropolitan City Route 21
서울특별시도 제21호선
Siheung - Jungnim Line
Route information
Length	17.7 km (11.0 mi)
Major junctions
From	Geumcheon District, Seoul
To	Jung 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 a road located in Seoul, South Korea. With a total length of 17.7 km (11.0 mi), this road starts from the Siheung-dong in Geumcheon District, Seoul to Jungnim-dong in Jung District.