The Esashi Line (江差線 Esashi-sen?) is a Japanese rail line operated by Hokkaido Railway Company (JR Hokkaido) that runs between Hakodate City and Esashi Town in Hokkaidō. For a topic outline on this subject see List of basic Japan topics. "Railroad" and "Railway" both redirect here For other uses see Railroad (disambiguation. The is one of the constituent companies of Japan Railways Group (JR Group and thus often known as. is a city and port located in Oshima, Hokkaidō, Japan. It is the capital city of Oshima Subprefecture WikipediaWikiProject Japanese prefectures for guidelines --> formerly known as Ezo, Yezo, Yeso, or Yesso, is Japan 's