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(Google Earth at 19°58'49.87" N 53°38'09.51" E)

Related to: What produces these distinct shapes in the Rub' al Khali seen from space?

What is the flat (?) green/blue-ish terrain in between the sand dunes? Seen directly from above it gives the illusion of a water surface reflecting a cloudy sky:

enter image description here
(wikipedia.org)

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