From Bulbapedia, the community-driven Pokémon encyclopedia.
(Japanese: ランセ地方 Ranse-chihō) is the name of the region that appears in the game Pokémon + Nobunaga's Ambition. It is said to be similar to feudal Japan. The region is divided into 17 nations, each with its own castle.
||From 乱世 Ransei, meaning "turbulent times".
||From its Japanese name.
The shape of the Ranse region resembles the Pokémon Arceus, which also plays an important role in the game's storyline.