The Tōhoku Main Line is a 575.7-kilometre-long (357.7 mi) railway line in Japan operated by the East Japan Railway Company. The line starts from Tokyo Station in Chiyoda, Tokyo and passes through such cities as Saitama, Utsunomiya, Fukushima, and Sendai, before reaching the end of the line in Morioka. The line originally extended to Aomori, but was truncated upon the extension of the Tōhoku Shinkansen beyond Morioka, which mostly parallels the Tōhoku Main Line. A portion of the Tōhoku Main Line is also shared with the Keihin–Tōhoku Line and the Saikyō Line.

Ōmiya is one of ten wards of the city of Saitama, in Saitama Prefecture, Japan, and is located in the northeastern part of the city. As of 1 March 2021, the ward had an estimated population of 119,298 and a population density of 9,300 persons per km². Its total area was 12.80 square kilometres (4.94 sq mi). Although Urawa-ku is the governmental center of Saitama City, Ōmiya-ku is the most active commercial and business centre in both Saitama City and Saitama Prefecture thanks to its transport infrastructure, especially railways connected at Ōmiya Station.