The ‘Hills of the Nile’ region, Colles Nili, marks the transition from the northern lowlands on Mars to the highlands in the south. This perspective view shows numerous inselbergs or ‘escarpment outliers’ – 1000 to 2000 metre high mountains that have been worn down by erosion. Numerous traces of ice flows can be identified Between these remnants of the highland that once stretched to the north. They have brought large quantities of debris with them and deposited this debris following glacial retreat. The dark colour visible in the left and upper parts of the image results from deposits of volcanic ash carried here by wind.