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Any of a series of long, wavelike ridges or grooves formed on a snow surface by the wind, especially in polar plains, and surfaces of ice-covered lakes/seas. These dunes of snow may be blown across the plains like wind-driven waves.

Wind sculpted snow near South Pole Station, forming sastrugi features.

Any of a series of long, wavelike ridges or grooves formed on a snow surface by the wind, especially in polar plains, and surfaces of ice-covered lakes/seas. These dunes of snow may be blown across the plains like wind-driven waves.

Large sastrugi seen in radar image around the south edge (left side) of Lake Vostok in Antarctica (RADARSAT, NASA). White and black colors on sastrugi are not lights and shadows; they demonstrate a difference in radioreflectivity of snow deposits on the windward and leeward sides of a sastruga.