Prism, the player character in Pokémon Prism, comes from an unidentified region west of Naljo.

Pokémon Brown Edit

At the end of Pokémon Brown, the region is briefly mentioned by the Pallet Patroller.

Pokémon Prism Edit

West of Naljo

A small part of the region is seen at the beginning, before the player accidentally travels to Naljo in a mine cart, after a landslide has occurred.