MSL will land in the relatively flat upper left landscape shown in this mosaic of images taken by the HiRISE camera aboard the Mars Reconnaissance Orbiter. From there, the rover will travel to the more rugged landscape to the lower right (dubbed Mount Sharp, in the center of Gale Crater). The resolution of this image is 1 meter per pixel.
Full size 13000×10000 pixels — 40MB (right click to save)
Here’s a mosaic of a significantly larger area, showing the individual HiRISE image strips covering the relevant north section of Gale Crater that contains MSL’s “landing ellipse”:
Full size 30017×46254 pixels — 240 MB (right click to save)
Turns out a lot of image programs (e.g. Photoshop) can’t display images greater than 30,000 pixels or so on a side. GIMP (free software) can handle the file.
Here’s a 30000×30000 crop of the mosaic that should be viewable by Photoshop:
Full size 30000×30000 pixels — 161 MB (right click to save)