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As we dropped down, waaaay off the distance to the north left (which is up in the "bells and whistles" movie, but way off to the left in the second movie) we saw some dark lines that are linear dunes. This is the margin of the great Shangri-la sand sea.

We are calling that location with the dunes a "water-ice rich plain" which is a mix of water ice fluvial deposited sediments, but then dark organic longitudinal dunes.

If you go further north deeper into Shangri-La then it is a big sand sea.