I am fairly certain that the Dry Deep in Essos should definitely have something to do with the fiery incident at Hardhome (in Westeros).
http://www.fantasticmaps.com/wp-content/uploads/2013/03/World_Of_Ice_And_Fire-1024x682.jpg
I was suspicious about the Dry Deep for a while now, but I just became certain while responding to another thread
Why am I so certain? Because the 5 Forts are almost completely (though in an opposite fashion) analogous to the Walls in many ways. The