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There are currently 3 Oasis Concepts, two of which have concept art accompanying them. This is the first one.
>Area Concept
Somewhere hidden in the desert is said to be a verdant oasis with the freshest water. It's definitely there, there are more than enough stories, but not a lot of people have actually found it. In wild contrast to the dry desert, it's filled with grasses, shrubs, palm trees, and even some apricorn and berry trees. Wild pokemon like to rest here, and you can find resting pokemon here that you couldn't otherwise find in the dry desert. The ruins of a mysterious shrine can be found here, but its significance has been lost to time.
>Layout Idea
See first image. A nice round oasis would be kinda boring, so I thought it should be longer and narrower. Along its edge is a grassy field with lots of trees and shrubs, some tall grass where you can encounter wild pokemon and even some apricorn and berry trees, it should look as lively as possible as sharp contrast to the arid desert. The shrine can be inspected but doesn't give you much information or anything.
It's surrounded by large rock outcroppings on all sides, except for a very small passage, which is how the player gains access.