Monday, June 9, 2008

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Located in southern Senegal is a feature that appears to be a meteor-impact-generated structure, possibly millions of years old. It is a circular, multiple ring structure with an overall diameter of 48 km (30 miles) and centered about 12 km (7 miles) south-southwest of the town of Velingara.

The high rim structure of the Velingara Crater encloses the Anambe Basin. Water previously flowing out the south end of the basin was harnessed behind a dam in the mid-1970s as a source of irrigation for rice and other crops. The 1975 image predates the irrigation development. By 2001 intense agricultural systems had appeared near the center of the crater(right image), contrasting sharply with the swampy areas (dark green) nearby. The Velingara Crater was first detected using Landsat data in the early 1970s.
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