Characteristics
According to their interpretations of Landsat Enhanced Thematic Mapper Plus (ETM + ) images, Radarsat-1 data, and SRTM data, El-Baz and Ghoneim described this circular feature as having a central peak, an inner ring, and discontinuous outer rim. The hypothetical outer rim is 31 kilometres (19 mi) in diameter. This feature consists of well-cemented, coarse- and fine-grained sandstones of the Gilf Kebir and Wadi Malik formations.
If this feature is an impact structure, it is bigger than the largest confirmed impact structure in the region, the Oasis crater in Libya, which is approximately half the size, with a diameter of approximately 18 kilometres (11 mi). It is estimated that a meteorite large enough to have created a Kebira-sized impact structure would have been roughly 1 kilometre (0.75 mi) in diameter.
Read more about this topic: Kebira Crater