This is a full resolution mosaic of Magellan orbits 492-524 centered at 25 degrees north latitude, 357 east longitude in southern Sedna Planitia on Venus.  The irregular circular feature or corona in the right center of the image is a low dome approximately 100 kilometers (60 miles) in diameter.  The corona is flanked by two major lava flows that extend downslope to the north for several hundred kilometers.  The entire region lies on the northern flank of a broad regional highland that contains the two volcanic centers of Sif Mons and Gula Mons.  The dark streak in the upper left of the image is associated with a small impact crater.  The object that formed the crater appears to have broken up in its passage through the dense Venusian atmosphere.  The radar dark streaks associated with small impact craters may form from interaction of an intense shock wave with the surface.  The radar-dark surface is smoother than its surroundings.