Gigas Sulci is an area of subparallel furrows and ridges in the Tharsis quadrangle of Mars, located at 10°00′N 127°48′W / 10°N 127.8°W / 10; -127.8. It is 398 km across and was named after a classical albedo feature name.^[1] The term "sulci" is applied to subparallel furrows and ridges.^[2]

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  Gigas Sulci, as seen by THEMIS. Wavy linear ridges are dunes. Dark slope streaks are visible on some slopes if you click on image for larger view.