What is Pokémon's first-generation region called?

The first-generation Pokémon games are set in the Kanto region. Players explore Kanto in Pokémon Red, Green, Blue, and Yellow while collecting Pokémon and challenging its eight Gym Leaders.

Kanto includes locations such as Pallet Town, Viridian City, Cerulean City, Celadon City, and the Pokémon League. Professor Oak's laboratory in Pallet Town is where the player's journey begins in the original games.

The region's name was not used in the first-generation games themselves; it was identified more explicitly in later games and related material. This detail can cause confusion when comparing the original releases with their sequels.

Kanto is based loosely on Japan's Kantō region, which includes Tokyo and surrounding areas. Later Pokémon games introduced new regions, including Johto, Hoenn, Sinnoh, Unova, Kalos, Alola, Galar, and Paldea.