Infra-Quirinelle is sort of strange place in the world of Aristasia. It represents the first handful of years of the 1960s, before the Eclipse or Telluria's counter culture change that began to happen with The Beatles, social revolution, and the Hippie movement.
In Aristasia Pura, its represented by an island off of Quirinelle. Depending upon which map you are viewing, this is either an island in the Golden Sea, or The Void.
It seemed there was a little bit of rebranding and rewriting of history of Infra, post Bridgehead, where they tried to not only change the name, but imply that "Infra" is a disparaging name. You can view some conversations about that in this old blog post here. Here are some choice quotes:
"It is worth noting that one of the ancient names of what is now Infraquirinelle (i.e. Lower Quirinelle, the island off the western Quirinelle coast) was Isle of Sapphire, though through a chain of sad incidents in a relative recent century caused the somewhat disparaging ‘infra’ to be in a preferred use by mainland dwellers."
It is interesting to note that "Lieutenant Fiona Gregoire" is the infamous Miss Iris, who later went on to criticize the weeaboification of Aristasia and then later went on to form an independent filianist group. Here she seems to have an authority on Aristasian Pura geography, and Miss Sushuri Madonna defers to Miss Gregoire's knowledge on the subject, which is interesting because usually Miss Sushuri is one of the only ones allowed to "invent" Aristasian lore, along with the woman also known as Miss Martindale. However, this information about the island's "ancient" name was available on the Aristasian website, so perhaps Miss Gregoire is just repeating that same information, and wasn't an originator of it.