Arcadia Planitia [SEP] located on astronomical body
Arcadia Planitia
Arcadia Planitia is a smooth plain with fresh lava flows and Amazonian volcanic flows on Mars. It was named by Giovanni Schiaparelli in 1882 after the Arcadia region of ancient Greece.
It dates from the Amazonian period's Arcadia formation's lava flows and small cinder cones. 
It includes a more recently developed large region of aeolian materials derived from periglacial processes. 
It is located northwest of the Tharsis region in the northern lowlands, spanning roughly the region 40-60° North and 150-180° West
on poleward facing slopes, especially from 30° to 44° S. Although thousands have been found, they appear to be restricted to only certain areas of the planet. In the northern hemisphere, they have been found in Arcadia Planitia, Tempe Terra, Acidalia Planitia, and Utopia Planitia. In the south, high concentrations are found on the northern edge of Argyre basin, in northern Noachis Terra, and along the walls of the Hellas outflow channels. A recent study examined 54,040 CTX images that covered 85% of the Martian