Proof?
All we know is that Xandes the First's tomb is emblazoned with the mark of Thaliak in Mor Dhona, and that a bigass airship screwed with the aether in the area when it picked a fight with a powerful wyrm.
Your image shows some rather dramatic mountainous region with no sign of flatlands surrounding such a lake or crash site.
Please share evidence that indicates that image is Mor Dhona, and not somewhere more snow covered, like Dravania is on the OP globe image.
EDIT: More evidence suggesting a new zone up north which could support this image:
EDIT: Map indicating Behemoth (marked with a '3') is nowhere near Mor Dhona:
