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How deep is the Hellas impact basin on Mars?

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Mars — Mars An especially serene view of Mars (Tharsis side), a composite of images taken by the Mars Global Surveyor spacecraft in April 1999. The northern polar cap and encircling dark dune field of Vastitas Borealis are visible at the top of the globe. White water-ice clouds surround the most prominent volcanic peaks, including Olympus Mons near the western limb, Alba Patera to its northeast, and the line of Tharsis volcanoes to the southeast. East of the Tharsis rise can be seen the enormous near-equatorial gash that marks the canyon system Valles Marineris.

The Hellas impact basin on Mars is 8 km (5 miles) deep. It is the largest recognizable impact feature on the planet, and its floor represents the lowest point on the Martian surface.123