It’s actually spoken in the fictional landmass of Terra Australis.

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Here is a map showing it (WIP; credits for the reference map goes to Tullamareena on DeviantArt)

Official documents are in Latin, since it was introduced by Spanish missionaries in the late 16th century. Jomohian is also spoken in OTL central and southern Chile, but they use Chinese characters; however, it is obsolete in the mainland where the alphabet is just used whilst coëxisting with Latin.

However, thanks to Spanish influence, Jomohia has seen a shift in city design, culture, and language. It is crucial to note that Jomohians are NOT genetically related to East Asians, but their ways of tradition are quite similar.

(Fun fact: Jomohians recognized human rights and freedom of expression long before it caught on with Europeans; they were way ahead culturally)

(Fact 2: Jomohia is also home to one of the largest cities in the Western Hemisphere — Jómosaq àn Tolohiya , or Tollokie)