Art from a map of the Orange Archipelago

Mandarin Island South (Japanese: マンダリン島 Mandarin Island) is located in the southern end of the Orange Archipelago. It is the largest island in the chain.

Mandarin Island South is home to many big cities and a large stadium, but much of the island is desert.

The island doesn't appear to have much in common with Mandarin Island North. It is believed that naming both islands the same name was a dubbing error, as the Japanese names are different for both.

In the anime, it is where Prima of the Elite Four trains during the off-season. Once a week, she gives lectures and demonstrates Pokémon battling techniques. This suggests a parallel between the Sevii Islands in Pokémon FireRed and LeafGreen and the Orange Archipelago, as the in-game information says that Lorelei is from Floe Island.

Both its English and Japanese names come from the common genus of orange, mandarin.