Phlegra Montes is a range of gently curving mountains and ridges on Mars. They extend from the northeastern portion of the Elysium volcanic province to the northern lowlands. the Phlegra Montes mountain range, in a region where radar probing indicates large volumes of water ice are hiding below. This could be a valuable source of water for future astronauts.
The mountains themselves are probably not volcanic in origin, but have been raised by ancient tectonic forces that squeezed different regions of the surface together.
New images from the high-resolution stereo camera on ESA’s Mars Express orbiter allowed a closer inspection and show that almost every mountain is surrounded by ‘lobate debris aprons’ – curved features typically observed around plateaus and mountains at these latitudes.