Seibu-en is an amusement park located near Tokyo in Tokorozawa, Saitama Prefecture. It is just outside the Seibuen-yūenchi Station, which is also owned and operated by the Seibu Railway. The park underwent a significant expansion and redesign for the 2021 season, focused around a Showa era themed marketplace, a Godzilla motion simulator attraction, and a children's area based on the work of Osamu Tezuka. Currently, an Ultraman attraction is in development for the 2023 season.

Tokorozawa is a city located in Saitama Prefecture, Japan. As of 1 February 2024, the city had an estimated population of 343,298 in 168,939 households and a population density of 4761 persons per km². The total area of the city is 72.11 square kilometres (27.84 sq mi).