LAST EDITED ON Jul-11-16 AT 04:53 AM (Pacific)Isle of Crypts is in the middle of the sea. (There is a huge many leveled dungeon there after which you are almost in the end of the game).
This area is Lesser Wilds. If memory serves, Fools map is supposed to lead you to the building where nothing happens. ("The map is a sketch of a vast wilderness, and drawn within it a trail which ends with an "X"..")