A perspective view of the topography Dali (to left) and Diana (to right) towards the southwest at 15 degrees south latitude, just to the east of Aphrodite Terra on Venus.  Vertical exaggeration is about twenty-to-one.  These valleys are 4 kilometers (3 miles) deep and about 65 kilometers (40 miles) wide, with walls sloping down at angles as steep as 25 degrees.  The data were obtained by Magellan's altimetry.