Hello !
What a job! The details are very impressive!

As far as the southern kingdom is concerned, I have no objections to your plan. Just maybe one question? Plateau and steppes seem to me to connect with the geography of the kingdom of Valmadar, but is a jungle next to a desert common? (I'm really asking the question, I'm not a geographer) As far as I'm concerned, I won't be disappointed if you go directly from steppe to plateau, to desert, without jungle. But maybe the jungle was an important element concerning worldbuilding? I'm very open to the question in any case.