Non-ecumene means regions of the world that are uninhabited or very sparsely populated. Usually the regions of the world that are ecumenic and non-ecumenic are hard to draw as many regions which are densely populated merge with sparsely populated regions and the boundaries that they do share are not static, as they can change with time and movement of people.
Mexico City is the location that has the highest population density. It is one of the most crowded cities in the world, so it is only natural that this is the correct answer here as well.
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Answer:
I think oasis
because wadis is probably a small dry region in a place where there are rains pouring sometimes