Vastitas

Water On Mars - Extinct Water Bodies - Mars Ocean Hypothesis
... The Mars Ocean Hypothesis proposes that the Vastitas Borealis basin was the site of an ocean of liquid water at least once, and presents evidence that nearly a third of the ... This ocean, dubbed Oceanus Borealis, would have filled the Vastitas Borealis basin in the northern hemisphere, a region which lies 4–5 km (2.5–3 miles) below the mean planetary elevation ... The lower, the 'Deuteronilus', follows the Vastitas Borealis formation ...

Vastitas Borealis
... Vastitas Borealis (Latin, 'northern waste' ) is the largest lowland region of Mars ... Vastitas Borealis is often simply referred to as the northern plains or northern lowlands of Mars ... Two distinct basins are recognized within the Vastitas Borealis the North Polar Basin and Utopia Planitia ...

Hesperian Chronology and Stratigraphy - Boundaries and Subdivisions
... with the younger Amazonian System is defined as the base of the Vastitas Borealis Formation (pictured right) ... The Vastitas Borealis is a vast, low-lying plain that covers much of the northern hemisphere of Mars ... Another interpretation of the Vastitas Borealis Formation is that it consists of lava flows ...