Illystana, the Capitol of the Deep is a location in Visions of Mana. It is the largest city in the world and a highly prosperous port city, with Undine as its Patron Spirit.
Illystana is a monarchy, but until recently a cabal of corrupt nobles, chief among them the wretched Master Passar, served as the power behind the throne, hoarding all wealth and oppressing the people. Their hold was broken by the late king, but the new regime is still fragile. The king's daughter and current queen Palamena has been anointed as the Alm of Water, forcing her to join the party and abdicate the throne in favour of her kid brother Prince Iain.
The wealthy merchant Niccolo based his Emporium here and the Luka Ruins and the Undertemple deep below surface level, and the magical Aqua Orb supplies the entire nation with fresh water. Gandoom stealing it threatens a drought, until the heroes destroy it and restore the Orb.