 The Hokkaidō Shinkansen line, which currently connects Honshu to Hakodate through the Seikan Tunnel, is planned to link to Sapporo by 2030.Sapporo is a city located in the southwest part of Ishikari Plain and the alluvial fan of the Toyohira River, a tributary stream of the Ishikari River.It is part of Ishikari Subprefecture.