Quantonia

Quantonia was a large country that used to be home for the Quantonians over 5000 years ago, It has been noted that Quantonia was a large mountainous region with a lot of forests very similar to Passivaria.
Quantonia as a nation was supported by natural pillars and cave systems beneath sea level that eroded over a course of millions of years gradually making the land itself fragile. This was a problem as a colossal earthquake happened that finally broke the natural pillars and caves causing a large scale collapse that happened over a course of weeks, parts of the nation would collapse each day causing large tsunamis that struck the east coast of Passivaria, West coast of Gorskalania and Wong Chee.
The aftershock of the earthquake also partially destabilized the Moeras region causing it to half sink and cause a lot of the landmass to be near sea level turning the nation from a lush forest region to a swampy marshland.
Not much is known about Quantonia as most of its contents were destroyed when it sunk.