This collection contains thousands images of impact craters from all continents except Antarctica. The map above shows that fewer craters have been discovered in South America, Asia, Africa and Australia, perhaps because these continents have been less explored in geological terms. Craters in Europe are excluded because they are difficult to see (due to intense glacial erosion in the recent past and due to relatively the dense vegetation (as with the equatorial rainforest zones of South America, Africa and Asia).