Asian Highway 1Route informationLength20,557 km (12,774 mi)Major junctionsEast endTokyo, Japan 35°41′03″N 139°46′29″E / 35.68417°N 139.77472°E / 35.68417; 139.77472West endIstanbul, Turkey 41°43′01″N 26°21′10″E / 41.71694°N 26.35278°E / 41.71694; 26.35278LocationCountriesTokyo, Japan via South Korea, North Korea, China, Southeast Asia, Bangladesh, India, Pakistan, Afghanistan and Iran to the border between Turkey and Bulgaria west of Istanbul where it joins end-on with European route E80 Highway systemAsian Highway Network