I don't think that is really right. Considering how much of the land in Against the Wall is Jungle and hwo the Clan are there too, I think that The Deruptus mountains should be near Labruscum. Also, despite horses usually being associated with flat lands all the references to Hippus homeland mention hills. I tend to think they live in the foothills of the Deruptus Mountains. Also, the Deruptus mountains seperate the main part of the continent from the swampy lowlands of the Sidar. They aren't just off to the side like that.
Dacius's request to the Undercouncil seems to indicate that the Umbrawood is to the north of his land, the great ocean to the east, the Deruptus Mountains to the south, and the foothills of Tempus Mor to the west. That isn't possible with that layout.
Also, the Illian capital isn't Graduk, but Garduk.
Edit: The hills of the Hippus are grassland hills, where their sheep graze. Although best known for their horses and horsemanship, the Hippus are masters of all animal husbandry. Before Rhoanna turned them into mercenaries they were mostly shepherds, whose battles were mostly over who could graze where.
The Amurite city of Nimarail was built on land stolen from the Aroul-Hippi, grassy hills that were once among the best places to graze. The Kuriotates settlement of Caledor was built in a fertile valley also stolen from the Hippus. I think it is safe to say that the Hippus are surrounded by the Amurites, Kuriotates, Elohim, and Khazad (whose lands until recently they thought were just uninhabited mountains).
While the Sheaim may have summoned the Infernals near their and the Elohim's lands, I do not believe that the Fane of the Lessers is there. Everyone who went to the Fane had to sail there, so I do not believe it is on the same continent as the Elohim, Malakim, or Balseraph empires. The Fane has been a dark corrupted land since the age of dragons. I believe Kael stated that the Elohim as a more peaceful good nation did not share a border with an evil they would need to combat, at least most of the time. Despite the age of their leader, the Sheaim are a very new civ, so the border between the Elohim and the Sheaim or the Illians they called in haven't existed for to long. The fact that Hyborem lacks the Immortality promotion in the Lord of the Balors scenario makes me think he had already been vanquished once, but that the Sheaim ritual was stopping him from returning entirely to hell so he stopped when his soul reached the Fane.