The Kanmonkyo Bridge (関門橋 Kanmonkyō Kanmon bridge) (Asian Highway Network AH1) is a suspension bridge crossing the Kanmon Straits, a stretch of water separating two of Japan's four main islands. On the Honshū side of the bridge is Shimonoseki (下関, which contributed "Kan" to the name of the strait) and on the Kyūshū side is Kitakyushu, whose former city and present ward, Moji (門司), gave the strait its "mon".

The Kanmonkyo bridge was opened to vehicles on November 14, 1973 and connected to the Kyūshū Expressway on March 27, 1984. It is the 34th largest suspension bridge in the world with a central span of 712 metres.

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