In the Pokémon TV series, what is the name of the island where Ash battles Blaine’s Gym?

Ash battles Blaine’s Gym on Cinnabar Island in the Pokémon TV series.

Cinnabar Island is a volcanic island in the Kanto region and the location of Blaine’s Gym. Ash travels there seeking his seventh Kanto Gym Badge. The first challenge takes place in the island’s volcanic setting, and Ash later returns for a rematch after learning more about Blaine’s battle style.

Blaine specializes in Fire-type Pokémon and uses Pokémon such as Ninetales and Magmar. Cinnabar Island is also known for its Pokémon Mansion in the games, although the anime presents locations and events with its own continuity. Pummelo Island belongs to the Orange Islands, while Valencia Island is associated with Professor Ivy. Mikan Island is another Orange Islands location, so none of those names identifies Blaine’s Kanto Gym.