Spectacular perspective view of Ares Vallis...

outflow channel on Mars has just been released showing streamlined landforms sculpted by an enormous flood of water early in the red planet's history (click image to enlarge):

Here's the related article that includes a context map and more fantastic images.  The terrestrial analog is, of course, the Channeled Scablands in eastern Washington.  Just in time to incorporate this into my talk in Wenatchee this Tuesday evening.

Image credit: ESA/DLR/FU Berlin (G. Neukum)