I was inspired by this Challenge when for fun I did a small test in AI for map making and it come out with something like this :

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The prompt to generate this image was make a map in Tolkien style ... Well you can see the results ... but this somehow reminded me of a desert world with a Canyon as the last remnant of habitable place , so I thought about following this patter, if I will have time I will try to update this ...

Basically the idea is to make a whole desert ravaged apocalyptic world with a massive worldwide canyon that preserves life somehow .

I tried to extrapolate a name from the weird signs I see on that map.

Btw a mod can change the name in the title from Valley to Canyon?