Today's Image of Mars is of a proposed future landing site in Ladon Valles on Mars. Ladon Valles is a 278km long outflow channel that connects with Ares Valles. It is part of a larger system that heads to Argyre Basin, which many scientists believe once contained a large ocean of water.
This image was published by HiRISE on November 1 2011, but is not currently captioned.
There are many sites on Mars that have been proposed as landing sites for future missions. Clicking on the image will take you to all HiRISE images of candidate landing sites.