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The lowest point relative to "sea level" of Mars (officially measured relative to the "reference ellipsoid" for Mars) is Hellas Planitia. This huge impact crater is about 7km (4.5 miles) below the reference ellipsoid (below "sea level").

By comparison, the Challenger Depth in the Marianas Trench is the lowest point on the Earth's surface and is about 11km below sea level. (The lowest land elevation is the Dead Sea -- 422m below sea level. Water likes to fill in hole on the earth's surface!)

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16y ago

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