There isn't one.  There is LV200 island, LV500 island, LV800 island, and the Dead Sea.  In the post-game more areas open after talking to Enah at the Guild.

I’d like to know!

Nevermind, found it in Elvust City via Quest....11 I think.

Happy to help friends!  Anyone with the Jolie bug- fight in the regular arena.  I did easy bronze mode.  It cleared the bug!

Next one is in Forest Village.  Behind a tree to the left of the house in the NW.  The house has 2 crates in front of it.

 

Last one is in the Mountain Village directly under the sign for the item shop.