Sindian
Sindian is a language primarily spoken in southern Aisoa, particularly Xeblisau, Zabria, and Huilan Guo. It is a very old language, and has origins stretching all the way back to when humans colonized the continent. Though it has surely changed massively since then, it is considered one of the oldest languages on the continent.
Sindian is a gendered language, each noun and verb having a predetermined gender from masculine, feminine, and neuter. It also has a base 20 numeric system.
Writing System
The sindian alphabet is old, and favors short straight lines that are easy to carve into stone and clay - modern sindian writing favors ink tipped styluses, pens, and quills, but is still slower to write than most other languages. The language also lends itself easily to simple ciphers, where overlaid letters craft a message that is difficult to read unless one knows where to start.
Geographical Distribution
Sindian is most common in the Dragonsbreath Isles and Southern Aisoa, where humans first landed on the continent.
In many Sindian speaking regions, cities generally end in 'sau', meaning town or settlement in the oldest Sindian dialects. Most begin with a term relating to the local geography - such as the city of "Susau", roughly translating to "Forest Town". It is not uncommon for there to be multiple cities or towns with the same name. However, port cities are more often named after historical figures, ships that brought settlers, or other such things.
Phonetics
Sindian is a highly tonal language, and many words have different meanings depending on the pitch they are spoken in. This tends to cause some confusion for new speakers, and many of the most common words used in trade have slowly flattened in tone to make speaking with foreigners simpler.
Due to the tonal nature of the language, native Sindian speakers are slightly more likely to develop an acute sense of pitch. This skill is of great benefit to the singers and musicians that speak the language.