The oldest of the Neimoidian purse worlds, Cato Neimoidia was the location of Nute Gunray's secret redoubt. The planet was near the Neimoidian homeworld of Neimoidia, also in the Colonies region.
Only the richest of the Neimoidians were allowed to live on the planet. Their treasures were protected in vaults located in difficult landscape and protected by B1 battle droids. The cities of Cato Neimoidia were built on large bridges spanning massive rock arches.
Cato Neimoidia featured vast forests rich in flora and fauna. Notable species included the Neimoidian kreehawk, a dangerous but beautiful avian found in some aviaries.