Past the Valley of Dust and Fire? No.
The Athasian Cartographer’s Guild effectively designed this entire continent and laid out the rest of the planet roughly, based on the maps from many previous players. What you’re seeing here is a portion of their full map, beautifully improved by Jhonny. The part beyond the Silt Sea is the the Sundered Regions (from another member’s posts).
We’ve been discussing this map in another feed as well: