Vastitas Borealis (vastitas,
Latin, widespread lowlands; borealis,
Latin, northern) is the largest lowland region of
Mars. It is in the northernly latitudes of the
planet and encircles the northern polar region. Vastitas Borealis is often simply referred to as the Northern plains or Northern lowlands of Mars. The plains lie 4–5 km below the mean radius of the planet. To the north lies
Planum Boreum.
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