On the Natan culture page, accessible through the Character Builder under Backstory > Culture > Natan, there are many references to:
The Vorin city-state of New Natanatan
However, the Vorin city-state of the Natan people is New Natanan.
– Wiki reference with source list: New Natanan - The Coppermind - 17th Shard
The following correction should be made to the Character Builder and anywhere else the Natan people are mentioned in the materials:
Incorrect: New Natanatan
Correct: New Natanan