HiRISE: The draa of Mars

Sandy landformsESP_034909_1755 formed by the wind or aeolian bedforms are classified by the wavelength–or length–between crests. On Mars we can observe four classes of bedforms (in order of increasing wavelengths): ripples, transverse aeolian ridges (known as TARs), dunes, and what are called “draa.” All of these are visible in this Juventae Chasma…. [More at link]

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