So, 4.0 will bring with it the ability to swim, much as 3.0 introduced flying as an exploration gimmick. Furthermore, unlike with flying which was limited to 3.0-Areas only (cited as due to 2.0 areas lacking anything interesting to see or do in the upward dimension) swimming will be introduced retroactively to some areas; thus far the only one named being Costa del Sol.
So, the purpose of this thread is asking a simple question. What aquatic locales that we've come across already in Eorzea would you like to be able to go swimming in?
Personally, I'd love to take a dip in the Sylphic Springs, located in the far north of the Slyphlands in the East Shroud.