... The irregular limit is a nice touch BTW.
It indeed is!
I wish, there would be a little bit more visible of what lays behind this “frontier no man should cross”, though.
Just some more tiles for the impression of a vast desert, for example. Basically as deep as scouts have vision on other game tiles, so 2-3 tiles.
It wouldn’t change anything about the gameplay, but add a lot to the “immersion”.