Assertion: primordial ocean | /r/HasProperty | dubbed borealis
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text: This primordial ocean, dubbed Paleo-Ocean and Oceanus Borealis , would have filled the basin Vastitas Borealis in the northern hemisphere, a region which lies 4–5 km (2.5–3 miles) below the mean planetary elevation, at a time period of approximately 4.1–3.8 billion years ago.