 The route is a long radial highway running east from the Tokyo ward of Sumida to the ward of Edogawa.It connects Tokyo's Mukojima Route in central Tokyo to the Keiyō Road which connects Tokyo to Chiba Prefecture and its capital, the city of Chiba.The Komatsugawa Route begins at Ryōgoku Junction with the Mukojima Route in Sumida ward above the Sumida River.