#earth, #yemen, 2013, 16°42'55"N 45°42'5"E #Linear #sand #dunes in the #Ramlat al-Sab'atayn, a region of #desert in north-central Yemen. This type of long, narrow #longitudinal dunes are called #seif and are oriented in a direction #parallel to the prevailing winds; they are alternating with salt flats, called #sabkhas. Image: DigitalGlobe, Google #fromabove
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