Arosian is a dialect/creole/form of the Moranguese language, which is mostly similar to the mother tongue, but with major influences from indigenous Fiarrian and Melanian languages - Mezapatani, most notably. It is spoken in Porto Capital, Aros and Ordland. Even tought both forms of the language are, to some degree, mutually inteligible, they are considered separated languages due to historical reasons.
See also: List of Placenames in Arosian.
[TECH: Moranguese is European Portuguese, Arosian is Brazilian Portuguese.]