The Kawagoe Line is a railway line in Japan operated by the East Japan Railway Company, which connects the cities of Saitama, Kawagoe, and Hidaka in Saitama Prefecture. The main transfer stations on the line are Ōmiya, Kawagoe, and Komagawa.

Saitama is the capital and largest city of Saitama Prefecture, Japan. Its area incorporates the former cities of Urawa, Ōmiya, Yono and Iwatsuki. It is a city designated by government ordinance. As of 1 February 2021, the city had an estimated population of 1,324,854, and a population density of 6,093 people per km². Its total area is 217.43 square kilometres (83.95 sq mi).