Hellas Planitia
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Hellas Planitia is a plain located within the huge, roughly circular impact basin Hellas located in the southern hemisphere of the planet Mars. Hellas is the third- or fourth-largest known impact crater in the Solar System. Wikipedia
Age: between 3.8 and 4.1 billion years ago
Coordinates: 42°24′S 70°30′E / 42.4°S 70.5°E
Depth: 7,152 m (23,465 ft)
Diameter: 2,300 km (1,400 mi)
Region: Hellas quadrangle, south of Iapygia