abstract:Elysium Planitia, located in the Elysium and Aeolis quadrangles, is a broad plain that straddles the equator of Mars, centered at .USGS Gazetteer of Planetary Nomenclature entry for Elysium Planitia It lies to the south of the volcanic province of Elysium, the second largest volcanic region on the planet, after Tharsis.
Located in the ElysiumPlanitia, a region near the Martian equator, the network of tunnels has long been obscured by volcanic activity on the plains above.
Using a ground-piercing radar sensor aboard the Mars Reconnaissance Orbiter, a team of scientists created 3-D maps of an equatorial region known as ElysiumPlanitia and the channels that run underneath the plains.