Right, brain is braining a bit so let's keep some momentum going - Artopian geography!
Kiln Creek is a river of molten glass that presumably flows from a volcano of some kind- the major settlement, also called Kiln Creek, is flanked on one side by the Clay Pits, and on the other by a desert (sand art pun goes here). The Clay Pits use the heat of the river and the kilns to fire the clay into terracotta for trade, with the firing methods being how Kiln Creek gets its business. They also offer much fancy glassware
The Cardboard Hills exist somewhere quite far from there, but I'm unsure of specifics. I'd imagine it's reasonably close to Artopia proper, and by extension the Shadelands, just because 1) the Kardbolds are a good introductory species for the travelling "region of the week" format, and 2) most of the Artopians are supplies that work well on paper, and cardboard is paper adjacent. So probably a paper kingdom first, with lots of origami structures, and then the Cardboard Hills.
Other than that, I like the idea of a watercolor themed set of islands, with the colours blending together around each other. The river of glass needs to end somewhere, but I'm not sure where, or even if there's a settlement at the end.
