Olympia Undae
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Olympia Undae is a vast dune field in the north polar region of the planet Mars. It consists of a broad "sand sea" or erg that partly rings the north polar plateau from about 120° to 240°E longitude a
Olympia Undae is the largest field of sand dunes on the planet Mars.
Olympia Undae dunes, as seen by HiRISE. Two sets of transverse dunes are visible, indicating varying wind direction. Olympia Undae is also known as the North Polar Erg.
Closeup, color-enhanced image of Olympia Undae dunes with melting/subliming ice-cap fragments. Note Barchan dunes and patterned ground. Width of image is about 1 km/3000 ft.
CRISM spectral signal for gypsum (polyhydrated sulfates) in Olympia Undae dunes.
Siton Undae
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Siton Undae is one of the largest and densest dune fields in the vicinity of Planum Boreum, the Martian northern polar ice-cap. It is named after one of the classical albedo features on Mars. Its name
Olympia Undae
…southward into the Vastitas Borealis. The Olympia Undae erg covers both the bulk of southern Olympia Planum and part of the northern Vastitas Borealis. Siton Undae Hyperboreae Undae…
Siton Undae
Dunes of Siton Undae from NASA's Thermal Emission Imaging System (THEMIS)
Siton Undae close up from NASA's Thermal Emission Imaging System (THEMIS)