Matsuyama is the capital city of Ehime Prefecture, on the island of Shikoku, in Japan and is also Shikoku's largest city. As of 1 October 2022, the city had an estimated population of 505,948 in 243,541 households and a population density of 1200 persons per km2. The total area of the city is 429.35 square kilometres (165.77 sq mi).

The Yosan Line is the principal railway line on the island of Shikoku in Japan, connecting the major cities of Shikoku, and via the Honshi-Bisan Line, with Honshu. It is operated by the Shikoku Railway Company, and is aligned approximately parallel with the Inland Sea coast, connecting the prefectural capitals of Takamatsu and Matsuyama and continuing on to Uwajima. The name of the line comes from Iyo (伊予) and Sanuki (讃岐), the old names of Ehime and Kagawa, respectively.