Margaritifer Terra

[1] The area reveals "chaos terrain", outflow channels, and alluvial plains that are indicative of massive flooding.

[4] Holden and Eberswalde, craters in Margaritifer Terra, are thought to have formerly held lakes because they contain deltas and iron/magnesium smectite minerals which need water to form.

Researchers think that great flood channels in this region were carved quickly in just weeks or months by catastrophic outflows of groundwater.

Martian ground water probably moved hundreds of kilometers, and in the process it dissolved many minerals from the rock it passed through.

On April 1, 2010, NASA released the first images under the HiWish program, with the public suggesting places for HiRISE to photograph.