STS047-151-304

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Spacecraft nadir point: 23.9° N, 29.9° E

Photo center point: 23.5° N, 30.0° E

Nadir to Photo Center: South

Spacecraft Altitude: 165 nautical miles (306km)
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Image Caption:
STS047-151-302, 304 SAHARAN WIND-ERODED LANDFORMS, Chad. Paral-
lel lines are channels, meters deep termed "megagrooves" that
have been carved in the local country rock by persistent winds in
a hyperarid climate over millions of years. Chains of yellow,
horn-shaped barchan dunes follow some of these. Individual dunes
can be detected.