And I don't think you can see Aranna in the background, I guess it's some unknown land to the west of Aranna.

Maybe it's the rock formations you can see in the lower right corner of the map for Choru?

You might be right! I'll travel to Choru and compare.

You can see them from Choru, too: lem.to/p/SCPM

Hmmmm...maybe it's a mirage?

It's a land yet to be imagined; can't wait to see what it's like... (ooohh perhaps it's more ancestral lands, this time with less flatness?)