The Kingdom of Wa'ah was a southern human nation ruled by the "Suerzain", a monarch. Dwarves of the Diadem trade with them, coming with their Caravan through the Ironriders land.
The kingdom was located between the Vhydic River (south of the Jeweled Princedoms) and the Na River (artery of the east's fertile coast).
It's known that the Suerzain doesn't not put taxes on the river-road trade, allowing northern trades to bring more flowing of goods.
They were probably related with the Princedoms of the Sunstruck Sea, but living in northern lands, they had more contacts with other cultures of the north.