National Route 12 () is a national highway in South Korea. It connects Okdo-myeon in Gunsan to Jinbong-myeon in Gimje. The section from Sinsido to Sinsi Intersection overlaps National Route 77 and the section from the Saemangeum Seawall to Simpo-ri is named the Sanmangeum East–West Road.
History On November 13, 2020, National Route No. 12 was constructed as the Gunsan–Gimje Line. Then on February 26, 2021, a section of the Sanmangeum East–West Road (Simpo-ri, Jinbong-myeon, Gimje-si) opened.
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