San'in Expressway (山陰自動車道 San'in Jidōsha-dō) is a proposed expressway extending from Tottori, Tottori prefecture to Mine, Yamaguchi prefecture, of Japan. It will follow a path along the northern (San'in) coast of Chūgoku region, passing through Tottori, Shimane, and Yamaguchi prefectures. It is numbered "E9" along with the Kyoto Jukan Expressway and the San'in Kinki Expressway. Currently, the following segments are designated as part of the National Expressway route: * Tottori-Masuda Route (鳥取益田線): Tottori -- Masuda, Shimane * Misumi Mine Route (三隅美祢線): Nagato, Yamaguchi -- Mine