Vista (Middle-earth)
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In the fiction of J. R. R. Tolkien, Vista (not an English word) is a part of the atmosphere that surrounds the world of Arda before the cataclysm at the end of the Second Age. Vista forms the inner layer of normal air: above it is Ilmen, and above that Vaiya.
Vista is the breathable air, with in the top part the clouds, and in the lower parts the paths of birds.