39. Iturralde, Bolivia
The Iturralde Crater (also known as the Araona Structure) is a suspected crater that may have formed in northern Bolivia in the relatively recent geological past. The feature is believed to have been caused by impact into the muddy alluvial flood plain in the Lower Amazon jungle. The circular depression is now roughly 8 kilometers across and 3 meters deep. The structure was discovered in Landsat data acquired in 1988, but was not visited successfully until 1998 because the region was inaccessible. Future expeditions hope to finally determine if the feature truly is an impact crater and, if so, constrain the nature of the impactor.
Courtesy of Scientific Visualization Studio, NASA Goddard Space Flight Center.