Thonthal is a North-Central Continent language, first spoken in the end of the first revolution by peoples that have formed the Duls Settlements. It is thought to have evolved from several languages of the Western Dantrian Civilization. It is the state language of Leykarya and was the state language of Darda and Xornerian.

As Leykarya used its seafaring capability to establish international ties, Thonthal spread to several other countries as a useful foreign language: peoples that traded with Leykarya began benefiting from sharing Thonthal, and it became a lingua franca first in the south and then in the north. Thonthal is not commonly spoken in Yammoe.

For a number of historical and linquistic reasons, Thonthal's evolution has been very slow. Over the course of more than 3000 years it hardly changed, and its most ancient forms are still readable by modern speakers. Various forms of Thonthal did evolve much faster in isolation from Leykarya, like some Thonthal versions in Loodori and the neighboring area of Rowlow.

Thonthala is a term used to denote the body of literature written in Thonthal.